Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Jan. 01, 2022	Dec. 31, 2021
Securities Available for Sale:
Amortized cost	$ 693,179		$ 946,511
Gross Unrealized Gains	325		3,562
Gross Unrealized Losses	(40,212)		(11,909)
Fair Value	653,292		938,164
Securities Held to Maturity:
Amortized Cost	307,009		0
Gross Unrealized Gains	0
Gross Unrealized Losses	(18,199)
Fair Value	288,810	$ 309,700
U.S. treasury securities
Securities Available for Sale:
Amortized cost	95,447		88,638
Gross Unrealized Gains	3		0
Gross Unrealized Losses	(4,449)		(1,087)
Fair Value	91,001		87,551
Securities Held to Maturity:
Amortized Cost	21,511
Gross Unrealized Gains	0
Gross Unrealized Losses	(776)
Fair Value	20,735
U.S. agency
Securities Available for Sale:
Amortized cost	7,143		17,916
Gross Unrealized Gains	3		5
Gross Unrealized Losses	(251)		(140)
Fair Value	6,895		17,781
Securities Held to Maturity:
Amortized Cost	15,507
Gross Unrealized Gains	0
Gross Unrealized Losses	(743)
Fair Value	14,764
Asset backed securities
Securities Available for Sale:
Amortized cost	28,887
Gross Unrealized Gains	0
Gross Unrealized Losses	(531)
Fair Value	28,356
State, county & municipal securities
Securities Available for Sale:
Amortized cost	174,561		252,632
Gross Unrealized Gains	15		877
Gross Unrealized Losses	(15,695)		(3,356)
Fair Value	158,881		250,153
Securities Held to Maturity:
Amortized Cost	88,781
Gross Unrealized Gains	0
Gross Unrealized Losses	(6,323)
Fair Value	82,458
Corporate debt securities
Securities Available for Sale:
Amortized cost	48,113		48,153
Gross Unrealized Gains	200		520
Gross Unrealized Losses	(1,719)		(265)
Fair Value	46,594		48,408
Mortgage-backed securities
Securities Available for Sale:
Amortized cost	339,028		539,172
Gross Unrealized Gains	104		2,160
Gross Unrealized Losses	(17,567)		(7,061)
Fair Value	321,565		$ 534,271
Securities Held to Maturity:
Amortized Cost	181,210
Gross Unrealized Gains	0
Gross Unrealized Losses	(10,357)
Fair Value	$ 170,853

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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