Securities - AFS in an Unrealized Loss Position (Details) $ in Thousands	Mar. 31, 2025 USD ($) item	Dec. 31, 2024 USD ($) item
Number of Securities
Unrealized loss for less than twelve months | item	15	35
Unrealized loss for twelve months or longer | item	335	326
Total | item	350	361
Fair Value
Unrealized loss for less than twelve months	$ 85,108	$ 144,494
Unrealized loss for twelve months or longer	1,190,128	1,203,380
Total	1,275,236	1,347,874
Unrealized Loss
Unrealized loss for less than twelve months	145	2,201
Unrealized loss for twelve months or longer	88,824	100,628
Total	$ 88,969	$ 102,829
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	$ 4,815	$ 4,762
Total	4,815	4,762
Unrealized Loss
Unrealized loss for twelve months or longer	178	229
Total	$ 178	$ 229
Bonds
Number of Securities
Unrealized loss for less than twelve months | item	4	5
Unrealized loss for twelve months or longer | item	14	14
Total | item	18	19
Fair Value
Unrealized loss for less than twelve months	$ 26,251	$ 32,699
Unrealized loss for twelve months or longer	60,835	63,719
Total	87,086	96,418
Unrealized Loss
Unrealized loss for less than twelve months	7	54
Unrealized loss for twelve months or longer	567	585
Total	$ 574	$ 639
Residential mortgage-backed securities
Number of Securities
Unrealized loss for less than twelve months | item	3	20
Unrealized loss for twelve months or longer | item	120	107
Total | item	123	127
Fair Value
Unrealized loss for less than twelve months	$ 14,861	$ 56,122
Unrealized loss for twelve months or longer	284,177	283,691
Total	299,038	339,813
Unrealized Loss
Unrealized loss for less than twelve months	63	1,384
Unrealized loss for twelve months or longer	31,470	37,116
Total	$ 31,533	$ 38,500
Commercial mortgage-backed securities
Number of Securities
Unrealized loss for less than twelve months | item	2	3
Unrealized loss for twelve months or longer | item	18	20
Total | item	20	23
Fair Value
Unrealized loss for less than twelve months	$ 29,906	$ 34,539
Unrealized loss for twelve months or longer	189,452	197,203
Total	219,358	231,742
Unrealized Loss
Unrealized loss for less than twelve months	53	70
Unrealized loss for twelve months or longer	6,035	6,090
Total	$ 6,088	$ 6,160
Collateralized mortgage obligations
Number of Securities
Unrealized loss for less than twelve months | item	1	2
Unrealized loss for twelve months or longer | item	133	132
Total | item	134	134
Fair Value
Unrealized loss for less than twelve months	$ 11,679	$ 9,944
Unrealized loss for twelve months or longer	617,751	629,089
Total	629,430	639,033
Unrealized Loss
Unrealized loss for less than twelve months	10	146
Unrealized loss for twelve months or longer	46,631	53,245
Total	$ 46,641	$ 53,391
Corporate debt securities
Number of Securities
Unrealized loss for less than twelve months | item		1
Unrealized loss for twelve months or longer | item	1
Total | item	1	1
Fair Value
Unrealized loss for less than twelve months		$ 9,271
Unrealized loss for twelve months or longer	$ 9,385
Total	9,385	9,271
Unrealized Loss
Unrealized loss for less than twelve months		538
Unrealized loss for twelve months or longer	538
Total	$ 538	$ 538
States and political subdivisions
Number of Securities
Unrealized loss for less than twelve months | item	5	4
Unrealized loss for twelve months or longer | item	48	52
Total | item	53	56
Fair Value
Unrealized loss for less than twelve months	$ 2,411	$ 1,919
Unrealized loss for twelve months or longer	23,713	24,916
Total	26,124	26,835
Unrealized Loss
Unrealized loss for less than twelve months	12	9
Unrealized loss for twelve months or longer	3,405	3,363
Total	$ 3,417	$ 3,372