Investment Securities - Summary of Available-for-sale Securities with Unrealized Loss (Details) $ in Thousands	Mar. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	$ 180,650	$ 107,930
Less than 12 months, unrealized loss	$ 2,723	$ 1,532
Less than 12 months, Number of securities | security	183	132
12 months or more, fair value	$ 825,543	$ 831,720
12 months or more, unrealized loss	$ 145,299	$ 137,674
12 months or more, Number of securities | security	427	420
Total fair value	$ 1,006,193	$ 939,650
Total unrealized loss	148,022	139,206
U.S. Treasury and government agencies
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	12,003	8,568
Less than 12 months, unrealized loss	$ 173	$ 83
Less than 12 months, Number of securities | security	23	22
12 months or more, fair value	$ 11,565	$ 11,631
12 months or more, unrealized loss	$ 974	$ 912
12 months or more, Number of securities | security	5	5
Total fair value	$ 23,568	$ 20,199
Total unrealized loss	1,147	995
U.S. government sponsored agencies
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	63,921	14,439
Less than 12 months, unrealized loss	$ 114	$ 35
Less than 12 months, Number of securities | security	10	4
12 months or more, fair value	$ 77,014	$ 74,211
12 months or more, unrealized loss	$ 10,894	$ 10,497
12 months or more, Number of securities | security	15	15
Total fair value	$ 140,935	$ 88,650
Total unrealized loss	11,008	10,532
States and political subdivisions
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	26,352	18,268
Less than 12 months, unrealized loss	$ 439	$ 136
Less than 12 months, Number of securities | security	66	32
12 months or more, fair value	$ 171,591	$ 167,346
12 months or more, unrealized loss	$ 28,110	$ 26,959
12 months or more, Number of securities | security	144	138
Total fair value	$ 197,943	$ 185,614
Total unrealized loss	28,549	27,095
Residential mortgage-backed securities
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	70,006	58,671
Less than 12 months, unrealized loss	$ 1,833	$ 1,150
Less than 12 months, Number of securities | security	75	66
12 months or more, fair value	$ 517,070	$ 529,895
12 months or more, unrealized loss	$ 95,499	$ 89,517
12 months or more, Number of securities | security	239	238
Total fair value	$ 587,076	$ 588,566
Total unrealized loss	97,332	90,667
Commercial mortgage-backed securities
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	6,380	6,000
Less than 12 months, unrealized loss	$ 152	$ 112
Less than 12 months, Number of securities | security	8	7
12 months or more, fair value	$ 44,290	$ 44,656
12 months or more, unrealized loss	$ 9,335	$ 9,270
12 months or more, Number of securities | security	21	21
Total fair value	$ 50,670	$ 50,656
Total unrealized loss	9,487	9,382
Bank-issued trust preferred securities
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	1,988	1,984
Less than 12 months, unrealized loss	$ 12	$ 16
Less than 12 months, Number of securities | security	1	1
12 months or more, fair value	$ 4,013	$ 3,981
12 months or more, unrealized loss	$ 487	$ 519
12 months or more, Number of securities | security	3	3
Total fair value	$ 6,001	$ 5,965
Total unrealized loss	$ 499	$ 535