Securities - AFS in an Unrealized Loss Position (Details) $ in Thousands	Mar. 31, 2026 USD ($) item	Dec. 31, 2025 USD ($) item
Number of Securities
Unrealized loss for less than twelve months | item	21	8
Unrealized loss for twelve months or longer | item	313	318
Total | item	334	326
Fair Value
Unrealized loss for less than twelve months	$ 194,460	$ 52,812
Unrealized loss for twelve months or longer	1,044,330	1,079,848
Total	1,238,790	1,132,660
Unrealized Loss
Unrealized loss for less than twelve months	1,978	978
Unrealized loss for twelve months or longer	68,118	66,160
Total	$ 70,096	$ 67,138
U.S. Treasury securities
Number of Securities
Unrealized loss for twelve months or longer | item	1	1
Total | item	1	1
Fair Value
Unrealized loss for twelve months or longer	$ 4,975	$ 4,943
Total	4,975	4,943
Unrealized Loss
Unrealized loss for twelve months or longer	24	55
Total	$ 24	$ 55
Bonds
Number of Securities
Unrealized loss for less than twelve months | item	3	2
Unrealized loss for twelve months or longer | item	13	13
Total | item	16	15
Fair Value
Unrealized loss for less than twelve months	$ 30,486	$ 2,811
Unrealized loss for twelve months or longer	39,033	41,004
Total	69,519	43,815
Unrealized Loss
Unrealized loss for less than twelve months	88	6
Unrealized loss for twelve months or longer	276	343
Total	$ 364	$ 349
Residential mortgage-backed securities
Number of Securities
Unrealized loss for less than twelve months | item	4	1
Unrealized loss for twelve months or longer | item	117	117
Total | item	121	118
Fair Value
Unrealized loss for less than twelve months	$ 36,324	$ 11,390
Unrealized loss for twelve months or longer	239,211	251,643
Total	275,535	263,033
Unrealized Loss
Unrealized loss for less than twelve months	269	46
Unrealized loss for twelve months or longer	22,570	22,018
Total	$ 22,839	$ 22,064
Commercial mortgage-backed securities
Number of Securities
Unrealized loss for less than twelve months | item	2	1
Unrealized loss for twelve months or longer | item	18	18
Total | item	20	19
Fair Value
Unrealized loss for less than twelve months	$ 25,392	$ 9,893
Unrealized loss for twelve months or longer	199,361	198,985
Total	224,753	208,878
Unrealized Loss
Unrealized loss for less than twelve months	249	43
Unrealized loss for twelve months or longer	3,816	4,339
Total	$ 4,065	$ 4,382
Collateralized mortgage obligations
Number of Securities
Unrealized loss for less than twelve months | item	10	3
Unrealized loss for twelve months or longer | item	125	128
Total | item	135	131
Fair Value
Unrealized loss for less than twelve months	$ 77,494	$ 21,597
Unrealized loss for twelve months or longer	529,882	550,788
Total	607,376	572,385
Unrealized Loss
Unrealized loss for less than twelve months	410	54
Unrealized loss for twelve months or longer	38,317	36,539
Total	$ 38,727	$ 36,593
Corporate debt securities
Number of Securities
Unrealized loss for less than twelve months | item	2	1
Unrealized loss for twelve months or longer | item	1	1
Total | item	3	2
Fair Value
Unrealized loss for less than twelve months	$ 24,764	$ 7,121
Unrealized loss for twelve months or longer	9,863	9,743
Total	34,627	16,864
Unrealized Loss
Unrealized loss for less than twelve months	962	829
Unrealized loss for twelve months or longer	388	475
Total	$ 1,350	$ 1,304
States and political subdivisions
Number of Securities
Unrealized loss for twelve months or longer | item	38	40
Total | item	38	40
Fair Value
Unrealized loss for twelve months or longer	$ 22,005	$ 22,742
Total	22,005	22,742
Unrealized Loss
Unrealized loss for twelve months or longer	2,727	2,391
Total	$ 2,727	$ 2,391