Securities (Schedule of Securities Available-for-Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 834,850	$ 821,254
Gross Unrealized Gains	21,780	5,436
Gross Unrealized Losses	(1,805)	(14,079)
Fair Value	854,825	812,611
Obligations of State and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	307,943	291,449
Gross Unrealized Gains	16,366	4,407
Gross Unrealized Losses	(9)	(1,323)
Fair Value	324,300	294,533
MBS/CMO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	526,907	529,805
Gross Unrealized Gains	5,414	1,029
Gross Unrealized Losses	(1,796)	(12,756)
Fair Value	$ 530,525	$ 518,078

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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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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