Quarterly report [Sections 13 or 15(d)]

INVESTMENT SECURITIES (Investment Portfolio Composition) (Details)

v3.26.3
INVESTMENT SECURITIES (Investment Portfolio Composition) (Details) - USD ($)
Sep. 30, 2026
Dec. 31, 2025
Available for Sale    
Amortized cost $ 893,054,000 $ 656,546,000
Unrealized Gains 76,000 2,051,000
Unrealized Losses 30,984,000 14,633,000
Allowance for Credit Losses (49,000) (42,000)
Fair Value 862,097,000 643,922,000
Federal Home Loan Bank   3,000,000.0
Federal Reserve Bank stock   5,100,000
Held to Maturity    
Amortized Cost 315,142,000 377,446,000
Unrealized Gains 0 930,000
Unrealized Losses 21,310,000 9,056,000
Fair Value 293,832,000 369,320,000
U.S. Government Treasury [Member]    
Available for Sale    
Amortized cost 605,514,000 331,495,000
Unrealized Gains 0 1,940,000
Unrealized Losses 11,171,000 171,000
Allowance for Credit Losses 0 0
Fair Value 594,343,000 333,264,000
Held to Maturity    
Amortized Cost   129,782,000
Unrealized Gains   0
Unrealized Losses   514,000
Fair Value   129,268,000
U.S. Government Agency [Member]    
Available for Sale    
Amortized cost 164,330,000 174,527,000
Unrealized Gains 76,000 71,000
Unrealized Losses 4,095,000 2,484,000
Allowance for Credit Losses 0 0
Fair Value 160,311,000 172,114,000
States and Political Subdivisions [Member]    
Available for Sale    
Amortized cost 35,004,000 36,918,000
Unrealized Gains 0 38,000
Unrealized Losses 2,429,000 2,045,000
Allowance for Credit Losses 0 0
Fair Value 32,575,000 34,911,000
Mortgage-Backed Securities [Member]    
Available for Sale    
Amortized cost 55,044,000 59,699,000
Unrealized Gains 0 2,000
Unrealized Losses 10,715,000 7,697,000
Allowance for Credit Losses 0 0
Fair Value 44,329,000 52,004,000
Held to Maturity    
Amortized Cost 315,142,000 247,664,000
Unrealized Gains 0 930,000
Unrealized Losses 21,310,000 8,542,000
Fair Value 293,832,000 240,052,000
Corporate Debt Securities [Member]    
Available for Sale    
Amortized cost 33,162,000 45,810,000
Unrealized Gains 0 0
Unrealized Losses 2,574,000 2,236,000
Allowance for Credit Losses (49,000) (42,000)
Fair Value $ 30,539,000 43,532,000
Other Securities [Member]    
Available for Sale    
Amortized cost   8,097,000
Unrealized Gains   0
Unrealized Losses   0
Allowance for Credit Losses   0
Fair Value   $ 8,097,000