Investment Securities (Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities
Amortized Cost	$ 1,294,654	$ 734,544
Gross Unrealized Gains	14,093	20,775
Gross Unrealized Losses	(11,657)	(2,306)
Available-for-sale securities	1,297,090	753,013
Gross Unrealized Gains	1,657	1,789
Securities Investment [Member]
Schedule of Available-for-sale Securities
Interest Receivable	5,700	2,700
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Amortized Cost	78,916	4,960
Gross Unrealized Gains	102	403
Gross Unrealized Losses	(537)	0
Available-for-sale securities	78,481	5,363
States and political subdivisions
Schedule of Available-for-sale Securities
Amortized Cost	252,706	110,401
Gross Unrealized Gains	3,220	4,642
Gross Unrealized Losses	(3,007)	(124)
Available-for-sale securities	252,919	114,919
Gross Unrealized Gains	675	510
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost	894,848	609,865
Gross Unrealized Gains	10,453	15,377
Gross Unrealized Losses	(6,842)	(2,024)
Available-for-sale securities	898,459	623,218
Gross Unrealized Gains	661	852
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost	63,568	4,622
Gross Unrealized Gains	85	161
Gross Unrealized Losses	(1,101)	0
Available-for-sale securities	62,552	4,783
Gross Unrealized Gains	236	427
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Amortized Cost	4,616	4,696
Gross Unrealized Gains	233	192
Gross Unrealized Losses	(170)	(158)
Available-for-sale securities	$ 4,679	$ 4,730

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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-Topic 320
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-Section 50
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Amount, before tax, of unrealized loss 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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