Investment Securities (Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities
Amortized Cost	$ 829,899	$ 929,395
Gross Unrealized Gains	24,417	11,298
Gross Unrealized Losses	(2,614)	(4,592)
Available-for-sale securities	851,702	936,101
Gross Unrealized Gains	1,944	889
Securities Investment [Member]
Schedule of Available-for-sale Securities
Interest Receivable	3,400	3,600
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Amortized Cost	4,958	7,917
Gross Unrealized Gains	425	292
Gross Unrealized Losses	0	0
Available-for-sale securities	5,383	8,209
States and political subdivisions
Schedule of Available-for-sale Securities
Amortized Cost	99,518	111,217
Gross Unrealized Gains	4,608	3,018
Gross Unrealized Losses	0	(131)
Available-for-sale securities	104,126	114,104
Gross Unrealized Gains	534	445
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost	710,254	787,430
Gross Unrealized Gains	19,052	7,763
Gross Unrealized Losses	(2,314)	(4,184)
Available-for-sale securities	726,992	791,009
Gross Unrealized Gains	954	169
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost	10,473	18,135
Gross Unrealized Gains	218	88
Gross Unrealized Losses	(123)	(135)
Available-for-sale securities	10,568	18,088
Gross Unrealized Gains	456	275
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Amortized Cost	4,696	4,696
Gross Unrealized Gains	114	137
Gross Unrealized Losses	(177)	(142)
Available-for-sale securities	$ 4,633	$ 4,691

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
-SubTopic 10
-Section 50
-Paragraph 2
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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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