Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Securities Available for Sale:
Amortized Cost	$ 825,235	$ 372,231
Gross Unrealized Gains	4,640	8,997
Gross Unrealized Losses	(9,250)	(414)
Fair Value	820,625	380,814
U.S. treasury securities
Securities Available for Sale:
Amortized Cost	43,034	245
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(652)	0
Fair Value	42,382	245
U.S. agency
Securities Available for Sale:
Amortized Cost	18,172	1,000
Gross Unrealized Gains	82	4
Gross Unrealized Losses	(165)	0
Fair Value	18,089	1,004
State, county & municipal securities
Securities Available for Sale:
Amortized Cost	199,074	61,298
Gross Unrealized Gains	486	1,155
Gross Unrealized Losses	(3,520)	(65)
Fair Value	196,040	62,388
Corporate debt securities
Securities Available for Sale:
Amortized Cost	39,448	4,250
Gross Unrealized Gains	120	1
Gross Unrealized Losses	(163)	(1)
Fair Value	39,405	4,250
Mortgage-backed securities
Securities Available for Sale:
Amortized Cost	525,507	305,438
Gross Unrealized Gains	3,952	7,837
Gross Unrealized Losses	(4,750)	(348)
Fair Value	$ 524,709	$ 312,927

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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