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Securities (Schedule of Securities Available-for-Sale) (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Securities Available-for-Sale, Amortized Cost	$ 1,367,856,000	$ 1,172,175,000
Gross Unrealized Gains	32,722,000	46,003,000
Gross Unrealized Losses	(14,705,000)	(326,000)
Allowance for Credit Losses	0	0
Fair Value	1,385,873,000	1,217,852,000
Obligations of State and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Securities Available-for-Sale, Amortized Cost	601,546,000	548,273,000
Gross Unrealized Gains	24,849,000	33,077,000
Gross Unrealized Losses	(2,547,000)	(103,000)
Allowance for Credit Losses	0	0
Fair Value	623,848,000	581,247,000
MBS/CMO
Debt Securities, Available-for-sale [Line Items]
Securities Available-for-Sale, Amortized Cost	654,447,000	535,526,000
Gross Unrealized Gains	7,873,000	12,806,000
Gross Unrealized Losses	(8,871,000)	(25,000)
Allowance for Credit Losses	0	0
Fair Value	653,449,000	548,307,000
US Gov't Sponsored Entities & Agencies
Debt Securities, Available-for-sale [Line Items]
Securities Available-for-Sale, Amortized Cost	111,863,000	88,376,000
Gross Unrealized Gains	0	120,000
Gross Unrealized Losses	(3,287,000)	(198,000)
Allowance for Credit Losses	0	0
Fair Value	$ 108,576,000	$ 88,298,000

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