Securities - Amortized Cost and Fair Value of Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,085,963	$ 1,104,105
Gross Unrealized Gains	687	261
Gross Unrealized Losses	(88,948)	(102,582)
Fair Value	997,702	1,001,784
Interest receivable	3,300	3,700
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	145,139	145,416
Gross Unrealized Gains	19	0
Gross Unrealized Losses	(11,454)	(13,721)
Fair Value	133,704	131,695
Obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	43,445	43,479
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,350)	(1,668)
Fair Value	42,095	41,811
Collateralized mortgage obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	479,804	482,039
Gross Unrealized Gains	309	203
Gross Unrealized Losses	(47,374)	(53,835)
Fair Value	432,739	428,407
Residential mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	48,273	49,418
Gross Unrealized Gains	5	3
Gross Unrealized Losses	(7,108)	(7,834)
Fair Value	41,170	41,587
Commercial mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	338,646	352,465
Gross Unrealized Gains	115	0
Gross Unrealized Losses	(21,662)	(25,152)
Fair Value	317,099	327,313
Corporate obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	0	500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	0	500
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	30,656	30,788
Gross Unrealized Gains	239	55
Gross Unrealized Losses	0	(372)
Fair Value	$ 30,895	$ 30,471