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Securities - Schedule of Debt Securities Components (Details) - USD ($)
Mar. 31, 2025
Dec. 31, 2024
Available-for-sale [Abstract]    
Amortized Cost $ 1,509,152,000 $ 1,587,416,000
Gross unrealized gains 7,187,000 1,210,000
Gross unrealized losses 58,400,000 54,732,000
Less: Allowance for Credit Losses 0 0
Securities AFS, at estimated fair value 1,457,939,000 1,533,894,000
HELD TO MATURITY    
Amortized Cost 1,278,394,000 1,279,234,000
Gross unrealized gains 1,056,000 4,029,000
Gross unrealized losses 170,342,000 169,781,000
Estimated Fair Value 1,109,108,000 1,113,482,000
Less: Allowance for Credit Losses 64,000 0
Net Carrying Amount 1,278,330,000 1,279,234,000
US Treasury Securities    
Available-for-sale [Abstract]    
Amortized Cost 133,331,000 173,880,000
Gross unrealized gains 10,000 76,000
Gross unrealized losses 0 0
Less: Allowance for Credit Losses 0 0
Securities AFS, at estimated fair value 133,341,000 173,956,000
State and political subdivisions    
Available-for-sale [Abstract]    
Amortized Cost 454,442,000 458,013,000
Gross unrealized gains 30,000 36,000
Gross unrealized losses 53,465,000 43,717,000
Less: Allowance for Credit Losses 0 0
Securities AFS, at estimated fair value 401,007,000 414,332,000
HELD TO MATURITY    
Amortized Cost 1,041,455,000 1,040,912,000
Gross unrealized gains 675,000 4,004,000
Gross unrealized losses 156,350,000 152,697,000
Estimated Fair Value 885,780,000 892,219,000
Less: Allowance for Credit Losses 27,000 0
Net Carrying Amount 1,041,428,000 1,040,912,000
Corporate bonds and other    
Available-for-sale [Abstract]    
Amortized Cost 14,666,000 14,646,000
Gross unrealized gains 226,000 263,000
Gross unrealized losses 508,000 401,000
Less: Allowance for Credit Losses 0 0
Securities AFS, at estimated fair value 14,384,000 14,508,000
HELD TO MATURITY    
Amortized Cost 124,256,000 124,095,000
Gross unrealized gains 369,000 17,000
Gross unrealized losses 5,763,000 6,553,000
Estimated Fair Value 118,862,000 117,559,000
Less: Allowance for Credit Losses 37,000 0
Net Carrying Amount 124,219,000 124,095,000
Residential    
Available-for-sale [Abstract]    
Amortized Cost [1] 901,493,000 935,639,000
Gross unrealized gains [1] 6,877,000 835,000
Gross unrealized losses [1] 3,978,000 10,088,000
Less: Allowance for Credit Losses 0 0
Securities AFS, at estimated fair value [1] 904,392,000 926,386,000
HELD TO MATURITY    
Amortized Cost [1] 83,303,000 84,660,000
Gross unrealized gains [1] 12,000 8,000
Gross unrealized losses [1] 6,646,000 8,549,000
Estimated Fair Value [1] 76,669,000 76,119,000
Less: Allowance for Credit Losses 0 0
Net Carrying Amount 83,303,000 84,660,000
Commercial    
Available-for-sale [Abstract]    
Amortized Cost [1] 5,220,000 5,238,000
Gross unrealized gains [1] 44,000 0
Gross unrealized losses [1] 449,000 526,000
Less: Allowance for Credit Losses 0 0
Securities AFS, at estimated fair value [1] 4,815,000 4,712,000
HELD TO MATURITY    
Amortized Cost [1] 29,380,000 29,567,000
Gross unrealized gains [1] 0 0
Gross unrealized losses [1] 1,583,000 1,982,000
Estimated Fair Value [1] 27,797,000 27,585,000
Less: Allowance for Credit Losses 0 0
Net Carrying Amount $ 29,380,000 $ 29,567,000
[1] All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.