Investment Securities (Available-for-sale Securities by Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	$ 1,708
Debt securities, maturing 1 to 5 years, amortized cost	31,114
Debt securities, maturing 5 to 10 years, amortized cost	76,777
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	709,832
Amortized Cost	819,431	$ 797,732
Debt securities, maturing within 1 year, fair value	1,703
Debt securities, maturing 1 to 5 years, fair value	30,627
Debt securities, maturing 5 to 10 years, fair value	75,006
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	685,989
Available-for-sale investment securities, at fair value (amortized cost of $819,431 at September 30, 2018 and $797,732 at December 31, 2017) (a)	$ 793,325	795,187
Available-for-sale securities, maturing within 1 year, average yield	2.52%
Available-for-sale securities, maturing 1 to 5 years, average yield	2.78%
Available-for-sale securities, maturing 5 to 10 years, average yield	3.38%
Available-for-sale securities, maturing over 10 years, average yield	2.84%
Available-for-sale securities, total average yield	2.88%
States and political subdivisions
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	$ 714
Debt securities, maturing 1 to 5 years, amortized cost	12,538
Debt securities, maturing 5 to 10 years, amortized cost	26,289
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	54,473
Debt securities, total amortized cost	94,014
Amortized Cost	94,014	100,039
Debt securities, maturing within 1 year, fair value	713
Debt securities, maturing 1 to 5 years, fair value	12,489
Debt securities, maturing 5 to 10 years, fair value	26,184
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	54,404
Available-for-sale investment securities, at fair value (amortized cost of $819,431 at September 30, 2018 and $797,732 at December 31, 2017) (a)	93,790	101,569
Debt securities, total fair value	93,790
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	994
Debt securities, maturing 1 to 5 years, amortized cost	12,898
Debt securities, maturing 5 to 10 years, amortized cost	46,292
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	654,176
Debt securities, total amortized cost	714,360
Amortized Cost	714,360	684,100
Debt securities, maturing within 1 year, fair value	990
Debt securities, maturing 1 to 5 years, fair value	12,590
Debt securities, maturing 5 to 10 years, fair value	44,656
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	630,420
Available-for-sale investment securities, at fair value (amortized cost of $819,431 at September 30, 2018 and $797,732 at December 31, 2017) (a)	688,656	673,664
Debt securities, total fair value	688,656
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	5,678
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	1,183
Debt securities, total amortized cost	6,861
Amortized Cost	6,861	7,004
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	5,548
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	1,165
Available-for-sale investment securities, at fair value (amortized cost of $819,431 at September 30, 2018 and $797,732 at December 31, 2017) (a)	6,713	6,976
Debt securities, total fair value	6,713
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	5,195
Debt securities, maturing 5 to 10 years, fair value	4,166
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 $819,431 at September 30, 2018 and $797,732 at December 31, 2017) (a)	4,166	$ 5,129
Debt securities, total fair value	$ 4,166

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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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