v3.26.3
Securities - Schedule of Debt Securities Components (Details) - USD ($)
Sep. 30, 2026
Dec. 31, 2025
Available-for-sale [Abstract]    
Amortized Cost $ 1,716,763,000 $ 1,456,986,000
Gross unrealized gains 269,000 17,095,000
Gross unrealized losses 93,533,000 17,862,000
Less: Allowance for Credit Losses 0 0
Securities AFS, at estimated fair value 1,623,499,000 1,456,219,000
HELD TO MATURITY    
Amortized Cost 1,207,519,000 1,247,502,000
Gross unrealized gains 1,014,000 2,994,000
Gross unrealized losses 247,135,000 147,192,000
Estimated Fair Value 961,398,000 1,103,304,000
Less: Allowance for Credit Losses 24,000 25,000
Net Carrying Amount 1,207,495,000 1,247,477,000
State and political subdivisions    
Available-for-sale [Abstract]    
Amortized Cost 190,891,000 192,268,000
Gross unrealized gains 3,000 1,423,000
Gross unrealized losses 32,936,000 17,055,000
Less: Allowance for Credit Losses 0 0
Securities AFS, at estimated fair value 157,958,000 176,636,000
HELD TO MATURITY    
Amortized Cost 1,044,582,000 1,042,986,000
Gross unrealized gains 128,000 2,290,000
Gross unrealized losses 236,712,000 139,719,000
Estimated Fair Value 807,998,000 905,557,000
Less: Allowance for Credit Losses 24,000 25,000
Net Carrying Amount 1,044,558,000 1,042,961,000
Corporate bonds and other    
Available-for-sale [Abstract]    
Amortized Cost 43,347,000 17,793,000
Gross unrealized gains 240,000 327,000
Gross unrealized losses 364,000 99,000
Less: Allowance for Credit Losses 0 0
Securities AFS, at estimated fair value 43,223,000 18,021,000
HELD TO MATURITY    
Amortized Cost 83,495,000 98,609,000
Gross unrealized gains 885,000 694,000
Gross unrealized losses 1,108,000 1,487,000
Estimated Fair Value 83,272,000 97,816,000
Less: Allowance for Credit Losses 0 0
Net Carrying Amount 83,495,000 98,609,000
Residential    
Available-for-sale [Abstract]    
Amortized Cost [1] 1,482,525,000 1,244,698,000
Gross unrealized gains [1] 26,000 15,278,000
Gross unrealized losses [1] 60,233,000 708,000
Less: Allowance for Credit Losses [1] 0 0
Securities AFS, at estimated fair value [1] 1,422,318,000 1,259,268,000
HELD TO MATURITY    
Amortized Cost [1] 70,746,000 77,080,000
Gross unrealized gains [1] 1,000 10,000
Gross unrealized losses [1] 8,013,000 4,898,000
Estimated Fair Value [1] 62,734,000 72,192,000
Less: Allowance for Credit Losses [1] 0 0
Net Carrying Amount [1] 70,746,000 77,080,000
Commercial    
Available-for-sale [Abstract]    
Amortized Cost [1] 0 2,227,000
Gross unrealized gains [1] 0 67,000
Gross unrealized losses [1] 0 0
Less: Allowance for Credit Losses [1] 0 0
Securities AFS, at estimated fair value [1] 0 2,294,000
HELD TO MATURITY    
Amortized Cost [1] 8,696,000 28,827,000
Gross unrealized gains [1] 0 0
Gross unrealized losses [1] 1,302,000 1,088,000
Estimated Fair Value [1] 7,394,000 27,739,000
Less: Allowance for Credit Losses [1] 0 0
Net Carrying Amount [1] $ 8,696,000 $ 28,827,000
[1] All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.