Investment Securities (Available-for-sale Securities by Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	$ 9,093
Debt securities, maturing 1 to 5 years, amortized cost	38,393
Debt securities, maturing 5 to 10 years, amortized cost	117,532
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	664,881
Amortized Cost	829,899	$ 929,395
Debt securities, maturing within 1 year, fair value	9,152
Debt securities, maturing 1 to 5 years, fair value	39,949
Debt securities, maturing 5 to 10 years, fair value	120,987
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	681,614
Available-for-sale investment securities, at fair value (amortized cost of $829,899 at September 30, 2020 and $929,395 at December 31, 2019) (a)	$ 851,702	936,101
Available-for-sale securities, maturing within 1 year, average yield	2.47%
Available-for-sale securities, maturing 1 to 5 years, average yield	2.67%
Available-for-sale securities, maturing 5 to 10 years, average yield	2.43%
Available-for-sale securities, maturing over 10 years, average yield	2.12%
Available-for-sale securities, total average yield	2.19%
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	4,958
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	0
Debt securities, total amortized cost	4,958
Amortized Cost	4,958	7,917
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	5,383
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	0
Debt securities, total fair value	5,383
Available-for-sale investment securities, at fair value (amortized cost of $829,899 at September 30, 2020 and $929,395 at December 31, 2019) (a)	5,383	8,209
States and political subdivisions
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	5,878
Debt securities, maturing 1 to 5 years, amortized cost	24,002
Debt securities, maturing 5 to 10 years, amortized cost	38,358
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	31,280
Debt securities, total amortized cost	99,518
Amortized Cost	99,518	111,217
Debt securities, maturing within 1 year, fair value	5,925
Debt securities, maturing 1 to 5 years, fair value	24,949
Debt securities, maturing 5 to 10 years, fair value	40,925
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	32,327
Debt securities, total fair value	104,126
Available-for-sale investment securities, at fair value (amortized cost of $829,899 at September 30, 2020 and $929,395 at December 31, 2019) (a)	104,126	114,104
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	5,898
Debt securities, maturing 5 to 10 years, amortized cost	73,518
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	630,836
Debt securities, total amortized cost	710,254
Amortized Cost	710,254	787,430
Debt securities, maturing within 1 year, fair value	2
Debt securities, maturing 1 to 5 years, fair value	5,995
Debt securities, maturing 5 to 10 years, fair value	74,425
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	646,570
Debt securities, total fair value	726,992
Available-for-sale investment securities, at fair value (amortized cost of $829,899 at September 30, 2020 and $929,395 at December 31, 2019) (a)	726,992	791,009
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	3,213
Debt securities, maturing 1 to 5 years, amortized cost	3,535
Debt securities, maturing 5 to 10 years, amortized cost	960
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	2,765
Debt securities, total amortized cost	10,473
Amortized Cost	10,473	18,135
Debt securities, maturing within 1 year, fair value	3,225
Debt securities, maturing 1 to 5 years, fair value	3,622
Debt securities, maturing 5 to 10 years, fair value	1,004
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	2,717
Debt securities, total fair value	10,568
Available-for-sale investment securities, at fair value (amortized cost of $829,899 at September 30, 2020 and $929,395 at December 31, 2019) (a)	10,568	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	4,633
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	0
Debt securities, total fair value	4,633
Available-for-sale investment securities, at fair value (amortized cost of $829,899 at September 30, 2020 and $929,395 at December 31, 2019) (a)	$ 4,633	$ 4,691

Available-for-sale Securities, Average Yield

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