Investment Securities Available-for-sale Securities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities
Amortized Cost	$ 929,395	$ 804,655
Gross Unrealized Gains	11,298	3,582
Gross Unrealized Losses	(4,592)	(16,346)
Fair Value	$ 936,101	$ 791,891
Federal income tax rate	21.00%	21.00%	35.00%
US Government-sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities
Amortized Cost	$ 7,917
Gross Unrealized Gains	292
Gross Unrealized Losses	0
Fair Value	8,209
States and political subdivisions
Schedule of Available-for-sale Securities
Amortized Cost	111,217	$ 88,358
Gross Unrealized Gains	3,018	787
Gross Unrealized Losses	(131)	(558)
Fair Value	114,104	88,587
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost	787,430	705,289
Gross Unrealized Gains	7,763	2,720
Gross Unrealized Losses	(4,184)	(15,401)
Fair Value	791,009	692,608
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost	18,135	6,812
Gross Unrealized Gains	88	0
Gross Unrealized Losses	(135)	(105)
Fair Value	18,088	6,707
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Amortized Cost	4,696	4,196
Gross Unrealized Gains	137	75
Gross Unrealized Losses	(142)	(282)
Fair Value	$ 4,691	$ 3,989

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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-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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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