Investment Securities (Available-for-sale Securities by Maturities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	$ 9,395
Debt securities, maturing 1 to 5 years, amortized cost	35,591
Debt securities, maturing 5 to 10 years, amortized cost	134,142
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	753,051
Amortized Cost	932,179	$ 929,395
Debt securities, maturing within 1 year, fair value	9,440
Debt securities, maturing 1 to 5 years, fair value	36,286
Debt securities, maturing 5 to 10 years, fair value	138,293
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	776,816
Available-for-sale investment securities, at fair value (amortized cost of $932,179 at March 31, 2020 and $929,395 at December 31, 2019) (a)	$ 960,835	936,101
Available-for-sale securities, maturing within 1 year, average yield	2.25%
Available-for-sale securities, maturing 1 to 5 years, average yield	2.63%
Available-for-sale securities, maturing 5 to 10 years, average yield	2.68%
Available-for-sale securities, maturing over 10 years, average yield	2.58%
Available-for-sale securities, total average yield	2.59%
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	$ 0
Debt securities, maturing 1 to 5 years, amortized cost	1,993
Debt securities, maturing 5 to 10 years, amortized cost	3,925
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	0
Debt securities, total amortized cost	5,918
Amortized Cost	5,918	7,917
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	2,115
Debt securities, maturing 5 to 10 years, fair value	4,246
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	0
Debt securities, total fair value	6,361
Available-for-sale investment securities, at fair value (amortized cost of $932,179 at March 31, 2020 and $929,395 at December 31, 2019) (a)	6,361	8,209
States and political subdivisions
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	4,641
Debt securities, maturing 1 to 5 years, amortized cost	23,918
Debt securities, maturing 5 to 10 years, amortized cost	42,744
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	34,601
Debt securities, total amortized cost	105,904
Amortized Cost	105,904	111,217
Debt securities, maturing within 1 year, fair value	4,655
Debt securities, maturing 1 to 5 years, fair value	24,299
Debt securities, maturing 5 to 10 years, fair value	44,538
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	35,320
Debt securities, total fair value	108,812
Available-for-sale investment securities, at fair value (amortized cost of $932,179 at March 31, 2020 and $929,395 at December 31, 2019) (a)	108,812	114,104
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	4
Debt securities, maturing 1 to 5 years, amortized cost	1,656
Debt securities, maturing 5 to 10 years, amortized cost	81,803
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	715,299
Debt securities, total amortized cost	798,762
Amortized Cost	798,762	787,430
Debt securities, maturing within 1 year, fair value	4
Debt securities, maturing 1 to 5 years, fair value	1,710
Debt securities, maturing 5 to 10 years, fair value	83,776
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	738,403
Debt securities, total fair value	823,893
Available-for-sale investment securities, at fair value (amortized cost of $932,179 at March 31, 2020 and $929,395 at December 31, 2019) (a)	823,893	791,009
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	4,750
Debt securities, maturing 1 to 5 years, amortized cost	8,024
Debt securities, maturing 5 to 10 years, amortized cost	974
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	3,151
Debt securities, total amortized cost	16,899
Amortized Cost	16,899	18,135
Debt securities, maturing within 1 year, fair value	4,781
Debt securities, maturing 1 to 5 years, fair value	8,162
Debt securities, maturing 5 to 10 years, fair value	1,025
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	3,093
Debt securities, total fair value	17,061
Available-for-sale investment securities, at fair value (amortized cost of $932,179 at March 31, 2020 and $929,395 at December 31, 2019) (a)	17,061	18,088
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Debt securities, maturing 5 to 10 years, amortized cost	4,696
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	0
Debt securities, total amortized cost	4,696
Amortized Cost	4,696	4,696
Debt securities, maturing 5 to 10 years, fair value	4,708
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	0
Debt securities, total fair value	4,708
Available-for-sale investment securities, at fair value (amortized cost of $932,179 at March 31, 2020 and $929,395 at December 31, 2019) (a)	$ 4,708	$ 4,691

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