Securities - Fair Value and Unrealized Losses on Debt Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	Jun. 30, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Available-for-sale:
Estimated Fair Value	$ 19,326	$ 296,224
Unrealized Losses	(1,122)	(20,715)
Estimated Fair Value	495,823	239,756
Unrealized Losses	(63,715)	(40,391)
Estimated Fair Value	515,149	535,980
Unrealized Losses	$ (64,837)	$ (61,106)
Number of Securities | security	218	219
Held-to-maturity:
Estimated Fair Value	$ 0	$ 32,273
Unrealized Losses	0	(5,677)
Estimated Fair Value	32,321	401
Unrealized Losses	(5,059)	(15)
Estimated Fair Value	32,321	32,674
Unrealized Losses	$ (5,059)	$ (5,692)
Number of Securities | security	23	23
U.S. treasury
Available-for-sale:
Estimated Fair Value	$ 0	$ 25,702
Unrealized Losses	0	(967)
Estimated Fair Value	56,869	30,947
Unrealized Losses	(5,120)	(4,394)
Estimated Fair Value	56,869	56,649
Unrealized Losses	$ (5,120)	$ (5,361)
Number of Securities | security	10	10
U.S. agency
Available-for-sale:
Estimated Fair Value	$ 0	$ 0
Unrealized Losses	0	0
Estimated Fair Value	2,228	2,834
Unrealized Losses	(36)	(47)
Estimated Fair Value	2,228	2,834
Unrealized Losses	$ (36)	$ (47)
Number of Securities | security	7	7
Obligations of states and political subdivisions
Available-for-sale:
Estimated Fair Value	$ 0	$ 21,676
Unrealized Losses	0	(3,784)
Estimated Fair Value	25,267	2,753
Unrealized Losses	(4,237)	(1,214)
Estimated Fair Value	25,267	24,429
Unrealized Losses	$ (4,237)	$ (4,998)
Number of Securities | security	18	18
Held-to-maturity:
Estimated Fair Value	$ 0	$ 20,153
Unrealized Losses	0	(4,891)
Estimated Fair Value	21,026	0
Unrealized Losses	(4,099)	0
Estimated Fair Value	21,026	20,153
Unrealized Losses	$ (4,099)	$ (4,891)
Number of Securities | security	8	8
Mortgage backed - residential
Available-for-sale:
Estimated Fair Value	$ 1,291	$ 51,921
Unrealized Losses	(100)	(2,939)
Estimated Fair Value	105,607	63,691
Unrealized Losses	(15,493)	(10,887)
Estimated Fair Value	106,898	115,612
Unrealized Losses	$ (15,593)	$ (13,826)
Number of Securities | security	85	87
Held-to-maturity:
Estimated Fair Value	$ 0	$ 7,993
Unrealized Losses	0	(511)
Estimated Fair Value	7,291	0
Unrealized Losses	(656)	0
Estimated Fair Value	7,291	7,993
Unrealized Losses	$ (656)	$ (511)
Number of Securities | security	10	10
Collateralized mortgage obligations
Available-for-sale:
Estimated Fair Value	$ 16,293	$ 111,360
Unrealized Losses	(1,007)	(4,631)
Estimated Fair Value	176,278	92,905
Unrealized Losses	(21,517)	(16,663)
Estimated Fair Value	192,571	204,265
Unrealized Losses	$ (22,524)	$ (21,294)
Number of Securities | security	66	66
Held-to-maturity:
Estimated Fair Value	$ 0	$ 4,127
Unrealized Losses	0	(275)
Estimated Fair Value	4,004	401
Unrealized Losses	(304)	(15)
Estimated Fair Value	4,004	4,528
Unrealized Losses	$ (304)	$ (290)
Number of Securities | security	5	5
Mortgage backed - commercial
Available-for-sale:
Estimated Fair Value	$ 1,742	$ 70,710
Unrealized Losses	(15)	(6,475)
Estimated Fair Value	114,521	46,626
Unrealized Losses	(15,582)	(7,186)
Estimated Fair Value	116,263	117,336
Unrealized Losses	$ (15,597)	$ (13,661)
Number of Securities | security	23	22
Other debt
Available-for-sale:
Estimated Fair Value	$ 0	$ 14,855
Unrealized Losses	0	(1,919)
Estimated Fair Value	15,053	0
Unrealized Losses	(1,730)	0
Estimated Fair Value	15,053	14,855
Unrealized Losses	$ (1,730)	$ (1,919)
Number of Securities | security	9	9