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Securities - Schedule of Debt Securities Components (Details) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Available-for-sale [Abstract]    
Amortized Cost $ 1,307,864,000 $ 1,587,416,000
Gross unrealized gains 13,045,000 1,210,000
Gross unrealized losses 28,478,000 54,732,000
Less: Allowance for Credit Losses 0 0
Securities AFS, at estimated fair value 1,292,431,000 1,533,894,000
HELD TO MATURITY    
Amortized Cost 1,263,456,000 1,279,234,000
Gross unrealized gains 1,453,000 4,029,000
Gross unrealized losses 158,723,000 169,781,000
Estimated Fair Value 1,106,186,000 1,113,482,000
Less: Allowance for Credit Losses 55,000 0
Net Carrying Amount 1,263,401,000 1,279,234,000
US Treasury Securities    
Available-for-sale [Abstract]    
Amortized Cost 49,650,000 173,880,000
Gross unrealized gains 12,000 76,000
Gross unrealized losses 0 0
Less: Allowance for Credit Losses 0 0
Securities AFS, at estimated fair value 49,662,000 173,956,000
State and political subdivisions    
Available-for-sale [Abstract]    
Amortized Cost 274,142,000 458,013,000
Gross unrealized gains 1,195,000 36,000
Gross unrealized losses 27,246,000 43,717,000
Less: Allowance for Credit Losses 0 0
Securities AFS, at estimated fair value 248,091,000 414,332,000
HELD TO MATURITY    
Amortized Cost 1,042,425,000 1,040,912,000
Gross unrealized gains 776,000 4,004,000
Gross unrealized losses 149,376,000 152,697,000
Estimated Fair Value 893,825,000 892,219,000
Less: Allowance for Credit Losses 26,000 0
Net Carrying Amount 1,042,399,000 1,040,912,000
Corporate bonds and other    
Available-for-sale [Abstract]    
Amortized Cost 16,717,000 14,646,000
Gross unrealized gains 460,000 263,000
Gross unrealized losses 234,000 401,000
Less: Allowance for Credit Losses 0 0
Securities AFS, at estimated fair value 16,943,000 14,508,000
HELD TO MATURITY    
Amortized Cost 112,668,000 124,095,000
Gross unrealized gains 665,000 17,000
Gross unrealized losses 2,716,000 6,553,000
Estimated Fair Value 110,617,000 117,559,000
Less: Allowance for Credit Losses 29,000 0
Net Carrying Amount 112,639,000 124,095,000
Residential    
Available-for-sale [Abstract]    
Amortized Cost [1] 965,126,000 935,639,000
Gross unrealized gains [1] 11,311,000 835,000
Gross unrealized losses [1] 998,000 10,088,000
Less: Allowance for Credit Losses 0 0
Securities AFS, at estimated fair value [1] 975,439,000 926,386,000
HELD TO MATURITY    
Amortized Cost [1] 79,349,000 84,660,000
Gross unrealized gains [1] 12,000 8,000
Gross unrealized losses [1] 5,416,000 8,549,000
Estimated Fair Value [1] 73,945,000 76,119,000
Less: Allowance for Credit Losses 0 0
Net Carrying Amount 79,349,000 84,660,000
Commercial    
Available-for-sale [Abstract]    
Amortized Cost [1] 2,229,000 5,238,000
Gross unrealized gains [1] 67,000 0
Gross unrealized losses [1] 0 526,000
Less: Allowance for Credit Losses 0 0
Securities AFS, at estimated fair value [1] 2,296,000 4,712,000
HELD TO MATURITY    
Amortized Cost [1] 29,014,000 29,567,000
Gross unrealized gains [1] 0 0
Gross unrealized losses [1] 1,215,000 1,982,000
Estimated Fair Value [1] 27,799,000 27,585,000
Less: Allowance for Credit Losses 0 0
Net Carrying Amount $ 29,014,000 $ 29,567,000
[1] All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.