Investment Securities - Available-for-sale Securities with Unrealized Loss (Details) $ in Thousands	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	$ 299,453	$ 826,981
Less than 12 months, unrealized loss	$ 12,051	$ 13,838
Less than 12 months, Number of securities | security	254	225
12 months or more, fair value	$ 803,481	$ 87,688
12 months or more, unrealized loss	$ 158,373	$ 3,894
12 months or more, Number of securities | security	308	27
Total fair value	$ 1,102,934	$ 914,669
Total unrealized loss	170,424	17,732
U.S. Treasury and government agencies
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	112,730	16,914
Less than 12 months, unrealized loss	$ 2,772	$ 17
Less than 12 months, Number of securities | security	13	6
12 months or more, fair value	$ 39,692	$ 0
12 months or more, unrealized loss	$ 3,279	$ 0
12 months or more, Number of securities | security	11	0
Total fair value	$ 152,422	$ 16,914
Total unrealized loss	6,051	17
U.S. government sponsored agencies
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	15,166	72,406
Less than 12 months, unrealized loss	$ 249	$ 1,192
Less than 12 months, Number of securities | security	17	13
12 months or more, fair value	$ 66,706	$ 4,854
12 months or more, unrealized loss	$ 13,407	$ 146
12 months or more, Number of securities | security	18	1
Total fair value	$ 81,872	$ 77,260
Total unrealized loss	13,656	1,338
States and political subdivisions
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	60,324	101,397
Less than 12 months, unrealized loss	$ 714	$ 2,075
Less than 12 months, Number of securities | security	114	71
12 months or more, fair value	$ 156,900	$ 30,853
12 months or more, unrealized loss	$ 35,028	$ 1,301
12 months or more, Number of securities | security	117	11
Total fair value	$ 217,224	$ 132,250
Total unrealized loss	35,742	3,376
Residential mortgage-backed securities
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	104,959	573,139
Less than 12 months, unrealized loss	$ 8,087	$ 9,051
Less than 12 months, Number of securities | security	105	113
12 months or more, fair value	$ 488,452	$ 51,103
12 months or more, unrealized loss	$ 95,302	$ 2,325
12 months or more, Number of securities | security	139	14
Total fair value	$ 593,411	$ 624,242
Total unrealized loss	103,389	11,376
Commercial mortgage-backed securities
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	1,874	60,134
Less than 12 months, unrealized loss	$ 129	$ 1,494
Less than 12 months, Number of securities | security	2	21
12 months or more, fair value	$ 48,175	$ 0
12 months or more, unrealized loss	$ 10,913	$ 0
12 months or more, Number of securities | security	21	0
Total fair value	$ 50,049	$ 60,134
Total unrealized loss	11,042	1,494
Bank-issued trust preferred securities
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	4,400	2,991
Less than 12 months, unrealized loss	$ 100	$ 9
Less than 12 months, Number of securities | security	3	1
12 months or more, fair value	$ 3,556	$ 878
12 months or more, unrealized loss	$ 444	$ 122
12 months or more, Number of securities | security	2	1
Total fair value	$ 7,956	$ 3,869
Total unrealized loss	$ 544	$ 131