Debt Securities - Schedule of Investments Classified by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less, amortized cost	$ 65,818
Due after one year through five years, amortized cost	383,566
Due after five years through ten years, amortized cost	149,458
Due after ten years, amortized cost	28,001
Total	626,843
Amortized cost	873,136	$ 1,261,740
Fair Value
Due in one year or less, estimated fair value	64,730
Due after one year through five years, estimated fair value	353,730
Due after five years through ten years, estimated fair value	127,771
Due after ten years, estimated fair value	23,959
Total	570,190
Fair Value	795,134	1,153,547
Amortized Cost
Due in one year or less, amortized cost	2,537
Due after one year through five years, amortized cost	146,159
Due after five years through ten years, amortized cost	231,104
Due after ten years, amortized cost	152,622
Total maturing securities, amortized cost	532,422
Debt securities held to maturity	1,075,190	1,129,421
Fair Value
Due in one year or less, estimated fair value	2,502
Due after one year through five years, estimated fair value	133,315
Due after five years through ten years, estimated fair value	200,270
Due after ten years, estimated fair value	130,403
Total maturing securities, fair value	466,490
Fair Value	895,263	924,894
Mortgage-backed securities
Amortized Cost
Amortized cost	5,448	6,165
Fair Value
Fair Value	5,311	5,944
Amortized Cost
Debt securities held to maturity	74,904	81,032
Fair Value
Fair Value	63,269	68,181
Collateralized mortgage obligations
Amortized Cost
Amortized cost	190,304	172,568
Fair Value
Fair Value	169,196	147,193
Amortized Cost
Debt securities held to maturity	467,864	509,643
Fair Value
Fair Value	365,504	$ 406,316
Collateralized loan obligations
Amortized Cost
Amortized cost	50,541
Fair Value
Fair Value	50,437
Amortized Cost
Debt securities held to maturity	0
Fair Value
Fair Value	$ 0