Investment Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value		$ 12,177
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss		(146)
Available-for-sale securities, Total, Fair Value		12,177
Available-for-sale securities, Total, Unrealized Loss		(146)
Total temporarily impaired securities, Duration Unrealized Loss Position, Less Than Twelve Months, Fair Value	$ 726,921	103,226
Total temporarily impaired securities, Duration of Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Loss	(12,916)	(847)
Total temporarily impaired securities, Duration of Unrealized Loss Position, Twelve Months or Longer, Fair Value	51,446
Total temporarily impaired securities, Duration of Unrealized Loss Position, Twelve Months or Longer, Gross Unrealized Loss	(2,043)
Total temporarily impaired securities, Duration of Unrealized Loss Position, Fair Value	778,367	103,226
Total temporarily impaired securities, Duration of Unrealized Loss Position, Unrealized Loss	(14,959)	(847)
Obligations of U.S. government corporations and agencies [Member]
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value	73,810
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss	(918)
Available-for-sale securities, Total, Fair Value	73,810
Available-for-sale securities, Total, Unrealized Loss	(918)
Mortgage-Backed Securities [Member]
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value	167,379	26,361
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss	(2,048)	(247)
Available-for-sale securities, Duration of Unrealized Loss Position, 12 Month or Longer, Fair Value	13,689
Available-for-sale Securities, Duration of Unrealized Loss Position, 12 Month or Longer, Gross Unrealized Loss	(333)
Available-for-sale securities, Total, Fair Value	181,068	26,361
Available-for-sale securities, Total, Unrealized Loss	(2,381)	(247)
Collateralized mortgage obligations [Member]
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value	222,134	5,161
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss	(4,736)	(160)
Available-for-sale securities, Total, Fair Value	222,134	5,161
Available-for-sale securities, Total, Unrealized Loss	(4,736)	(160)
Asset-backed securities [Member]
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value	140,226	18,439
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss	(1,589)	(98)
Available-for-sale securities, Duration of Unrealized Loss Position, 12 Month or Longer, Fair Value	2,705
Available-for-sale Securities, Duration of Unrealized Loss Position, 12 Month or Longer, Gross Unrealized Loss	(30)
Available-for-sale securities, Total, Fair Value	142,931	18,439
Available-for-sale securities, Total, Unrealized Loss	(1,619)	(98)
Corporate bonds [Member]
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value	24,173
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss	(270)
Available-for-sale securities, Duration of Unrealized Loss Position, 12 Month or Longer, Fair Value	504
Available-for-sale Securities, Duration of Unrealized Loss Position, 12 Month or Longer, Gross Unrealized Loss	(5)
Available-for-sale securities, Total, Fair Value	24,677
Available-for-sale securities, Total, Unrealized Loss	(275)
Obligations of state and political subdivisions [Member]
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value	99,199	41,088
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss	(3,355)	(196)
Available-for-sale securities, Duration of Unrealized Loss Position, 12 Month or Longer, Fair Value	34,548
Available-for-sale Securities, Duration of Unrealized Loss Position, 12 Month or Longer, Gross Unrealized Loss	(1,675)
Available-for-sale securities, Total, Fair Value	133,747	41,088
Available-for-sale securities, Total, Unrealized Loss	$ (5,030)	$ (196)