Fair Value of Financial Instruments (Assets Measured at Fair Value Recurring) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Recurring Basis
Available-for-sale securities	$ 960,835	$ 936,101
U.S. government sponsored agencies
Recurring Basis
Available-for-sale securities	6,361	8,209
States and political subdivisions
Recurring Basis
Available-for-sale securities	108,812	114,104
Residential mortgage-backed securities
Recurring Basis
Available-for-sale securities	823,893	791,009
Commercial mortgage-backed securities
Recurring Basis
Available-for-sale securities	17,061	18,088
Bank-issued trust preferred securities
Recurring Basis
Available-for-sale securities	4,708	4,691
Equity investment securities (a)
Recurring Basis
Other investment securities	289	321
Recurring Basis [Member] \| Level 1
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| Level 2
Recurring Basis
Available-for-sale securities	960,835	936,101
Interest Rate Derivative Assets, at Fair Value	30,235	11,419
Interest Rate Derivative Liabilities, at Fair Value	43,659	15,116
Recurring Basis [Member] \| Level 3
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| U.S. government sponsored agencies \| Level 1
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| U.S. government sponsored agencies \| Level 2
Recurring Basis
Available-for-sale securities	6,361	8,209
Recurring Basis [Member] \| U.S. government sponsored agencies \| Level 3
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| States and political subdivisions \| Level 1
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| States and political subdivisions \| Level 2
Recurring Basis
Available-for-sale securities	108,812	114,104
Recurring Basis [Member] \| States and political subdivisions \| Level 3
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| Residential mortgage-backed securities \| Level 1
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| Residential mortgage-backed securities \| Level 2
Recurring Basis
Available-for-sale securities	823,893	791,009
Recurring Basis [Member] \| Residential mortgage-backed securities \| Level 3
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| Commercial mortgage-backed securities \| Level 1
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| Commercial mortgage-backed securities \| Level 2
Recurring Basis
Available-for-sale securities	17,061	18,088
Recurring Basis [Member] \| Commercial mortgage-backed securities \| Level 3
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| Bank-issued trust preferred securities \| Level 1
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| Bank-issued trust preferred securities \| Level 2
Recurring Basis
Available-for-sale securities	4,708	4,691
Recurring Basis [Member] \| Bank-issued trust preferred securities \| Level 3
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| Equity investment securities (a) \| Level 1
Recurring Basis
Other investment securities	83	123
Recurring Basis [Member] \| Equity investment securities (a) \| Level 2
Recurring Basis
Other investment securities	$ 206	$ 198

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

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Amount of investments classified as other.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f,g))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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