Investment Securities (Available-for-sale Securities by Maturities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	$ 891
Debt securities, maturing 1 to 5 years, amortized cost	33,000
Debt securities, maturing 5 to 10 years, amortized cost	90,460
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	682,290
Amortized Cost	806,641	$ 804,655
Debt securities, maturing within 1 year, fair value	889
Debt securities, maturing 1 to 5 years, fair value	32,957
Debt securities, maturing 5 to 10 years, fair value	89,819
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	678,905
Available-for-sale investment securities, at fair value (amortized cost of $806,641 at March 31, 2019 and $804,655 at December 31, 2018)	$ 802,570	791,891
Available-for-sale securities, maturing within 1 year, average yield	2.26%
Available-for-sale securities, maturing 1 to 5 years, average yield	2.53%
Available-for-sale securities, maturing 5 to 10 years, average yield	2.75%
Available-for-sale securities, maturing over 10 years, average yield	3.00%
Available-for-sale securities, total average yield	2.95%
States and political subdivisions
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	$ 889
Debt securities, maturing 1 to 5 years, amortized cost	15,450
Debt securities, maturing 5 to 10 years, amortized cost	23,997
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	43,486
Debt securities, total amortized cost	83,822
Amortized Cost	83,822	88,358
Debt securities, maturing within 1 year, fair value	887
Debt securities, maturing 1 to 5 years, fair value	15,504
Debt securities, maturing 5 to 10 years, fair value	24,388
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	44,048
Available-for-sale investment securities, at fair value (amortized cost of $806,641 at March 31, 2019 and $804,655 at December 31, 2018)	84,827	88,587
Debt securities, total fair value	84,827
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	2
Debt securities, maturing 1 to 5 years, amortized cost	11,925
Debt securities, maturing 5 to 10 years, amortized cost	62,267
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	637,723
Debt securities, total amortized cost	711,917
Amortized Cost	711,917	705,289
Debt securities, maturing within 1 year, fair value	2
Debt securities, maturing 1 to 5 years, fair value	11,865
Debt securities, maturing 5 to 10 years, fair value	61,313
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	633,796
Available-for-sale investment securities, at fair value (amortized cost of $806,641 at March 31, 2019 and $804,655 at December 31, 2018)	706,976	692,608
Debt securities, total fair value	706,976
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	5,625
Debt securities, maturing 5 to 10 years, amortized cost	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	1,081
Debt securities, total amortized cost	6,706
Amortized Cost	6,706	6,812
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	5,588
Debt securities, maturing 5 to 10 years, fair value	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	1,061
Available-for-sale investment securities, at fair value (amortized cost of $806,641 at March 31, 2019 and $804,655 at December 31, 2018)	6,649	6,707
Debt securities, total fair value	6,649
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Debt securities, maturing 5 to 10 years, amortized cost	4,196
Available-for-sale Securities, Other Maturities, Rolling after Year Ten, Amortized Cost Basis	0
Available-for-sale Securities, Other Maturities, Amortized Cost Basis	4,196
Amortized Cost	4,196	4,196
Debt securities, maturing 5 to 10 years, fair value	4,118
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	0
Available-for-sale investment securities, at fair value (amortized cost of $806,641 at March 31, 2019 and $804,655 at December 31, 2018)	4,118	$ 3,989
Debt securities, total fair value	$ 4,118

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Amortized cost of 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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