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Securities (Schedule of Securities Available-for-Sale) (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,551,044,000	$ 1,172,175,000
Gross Unrealized Gains	40,764,000	46,003,000
Gross Unrealized Losses	(6,460,000)	(326,000)
Allowance for Credit Losses	0	0
Fair Value	1,585,348,000	1,217,852,000
Obligations of State and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	701,326,000	548,273,000
Gross Unrealized Gains	33,137,000	33,077,000
Gross Unrealized Losses	(566,000)	(103,000)
Allowance for Credit Losses	0	0
Fair Value	733,897,000	581,247,000
MBS/CMO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	704,460,000	535,526,000
Gross Unrealized Gains	7,283,000	12,806,000
Gross Unrealized Losses	(5,248,000)	(25,000)
Allowance for Credit Losses	0	0
Fair Value	706,495,000	548,307,000
US Gov't Sponsored Entities & Agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	145,258,000	88,376,000
Gross Unrealized Gains	344,000	120,000
Gross Unrealized Losses	(646,000)	(198,000)
Allowance for Credit Losses	0	0
Fair Value	$ 144,956,000	$ 88,298,000

X

- Definition

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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