Fair Value of Financial Instruments (Assets Measured at Fair Value Recurring) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Recurring Basis
Available-for-sale securities	$ 849,637	$ 753,013
U.S. government sponsored agencies
Recurring Basis
Available-for-sale securities	14,235	5,363
States and political subdivisions
Recurring Basis
Available-for-sale securities	223,853	114,919
Residential mortgage-backed securities
Recurring Basis
Available-for-sale securities	579,152	623,218
Commercial mortgage-backed securities
Recurring Basis
Available-for-sale securities	27,631	4,783
Bank-issued trust preferred securities
Recurring Basis
Available-for-sale securities	4,766	4,730
Equity investment securities (a)
Recurring Basis
Other investment securities	372	299
Recurring Basis [Member] \| Level 1
Recurring Basis
Available-for-sale securities	0	0
Interest Rate Derivative Assets, at Fair Value	0	0
Interest Rate Derivative Liabilities, at Fair Value	0	0
Recurring Basis [Member] \| Level 2
Recurring Basis
Available-for-sale securities	849,637	753,013
Interest Rate Derivative Assets, at Fair Value	17,957	27,332
Interest Rate Derivative Liabilities, at Fair Value	26,073	39,395
Recurring Basis [Member] \| Level 3
Recurring Basis
Available-for-sale securities	0	0
Interest Rate Derivative Assets, at Fair Value	0	0
Interest Rate Derivative Liabilities, at Fair Value	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	14,235	5,363
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	223,853	114,919
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	579,152	623,218
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	27,631	4,783
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	4,766	4,730
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	135	107
Recurring Basis [Member] \| Equity investment securities (a) \| Level 2
Recurring Basis
Other investment securities	237	192
Recurring Basis [Member] \| Equity investment securities (a) \| Level 3
Recurring Basis
Other investment securities	$ 0	$ 0

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

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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

+ References

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Amount of investments classified as other.

+ References

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=120400017&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=120391452&loc=d3e13212-122682

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