Investment Securities - Held-to-maturity Securities with Unrealized Loss (Details) $ in Thousands	Mar. 31, 2022 USD ($) securities	Dec. 31, 2021 USD ($) securities
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	$ 275,421	$ 235,557
Less than 12 months, unrealized loss	$ 27,291	$ 4,089
Less than 12 months, no. of securities | securities	113	78
12 months or more, fair value	$ 59,372	$ 41,963
12 months or more, unrealized loss	$ 9,638	$ 1,729
12 months or more, no. of securities | securities	15	8
Total fair value	$ 334,793	$ 277,520
Total unrealized loss	36,929	5,818
U.S. government sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	11,406	17,328
Less than 12 months, unrealized loss	$ 757	$ 504
Less than 12 months, no. of securities | securities	4	6
12 months or more, fair value	$ 22,875	$ 14,635
12 months or more, unrealized loss	$ 3,448	$ 500
12 months or more, no. of securities | securities	5	2
Total fair value	$ 34,281	$ 31,963
Total unrealized loss	4,205	1,004
States and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	100,780	61,954
Less than 12 months, unrealized loss	$ 12,979	$ 1,041
Less than 12 months, no. of securities | securities	62	34
12 months or more, fair value	$ 29,521	$ 27,328
12 months or more, unrealized loss	$ 4,772	$ 1,229
12 months or more, no. of securities | securities	9	6
Total fair value	$ 130,301	$ 89,282
Total unrealized loss	17,751	2,270
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	104,302	88,937
Less than 12 months, unrealized loss	$ 7,427	$ 919
Less than 12 months, no. of securities | securities	22	17
12 months or more, fair value	$ 0	$ 0
12 months or more, unrealized loss	$ 0	$ 0
12 months or more, no. of securities | securities	0	0
Total fair value	$ 104,302	$ 88,937
Total unrealized loss	7,427	919
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	58,933	67,338
Less than 12 months, unrealized loss	$ 6,128	$ 1,625
Less than 12 months, no. of securities | securities	25	21
12 months or more, fair value	$ 6,976	$ 0
12 months or more, unrealized loss	$ 1,418	$ 0
12 months or more, no. of securities | securities	1	0
Total fair value	$ 65,909	$ 67,338
Total unrealized loss	$ 7,546	$ 1,625