Investment Securities (Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities
Amortized Cost	$ 932,179	$ 929,395
Gross Unrealized Gains	29,864	11,298
Gross Unrealized Losses	(1,208)	(4,592)
Available-for-sale securities	960,835	936,101
Gross Unrealized Gains	1,944	889
Securities Investment [Member]
Schedule of Available-for-sale Securities
Interest Receivable	3,800	3,600
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Amortized Cost	5,918	7,917
Gross Unrealized Gains	443	292
Gross Unrealized Losses	0	0
Available-for-sale securities	6,361	8,209
States and political subdivisions
Schedule of Available-for-sale Securities
Amortized Cost	105,904	111,217
Gross Unrealized Gains	3,026	3,018
Gross Unrealized Losses	(118)	(131)
Available-for-sale securities	108,812	114,104
Gross Unrealized Gains	504	445
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost	798,762	787,430
Gross Unrealized Gains	25,914	7,763
Gross Unrealized Losses	(783)	(4,184)
Available-for-sale securities	823,893	791,009
Gross Unrealized Gains	1,020	169
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost	16,899	18,135
Gross Unrealized Gains	279	88
Gross Unrealized Losses	(117)	(135)
Available-for-sale securities	17,061	18,088
Gross Unrealized Gains	420	275
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Amortized Cost	4,696	4,696
Gross Unrealized Gains	202	137
Gross Unrealized Losses	(190)	(142)
Available-for-sale securities	$ 4,708	$ 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).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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