Investment Securities (Available-for-sale Securities by Maturities) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	$ 9,034
Debt securities, maturing 1 to 5 years, amortized cost	33,286
Debt securities, maturing 5 to 10 years, amortized cost	113,380
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	683,982
Amortized Cost	839,682	$ 734,544
Debt securities, maturing within 1 year, fair value	9,112
Debt securities, maturing 1 to 5 years, fair value	34,461
Debt securities, maturing 5 to 10 years, fair value	115,090
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	690,974
Available-for-sale investment securities, at fair value (amortized cost of $839,682 at June 30, 2021 and $734,544 at December 31, 2020) (a)	$ 849,637	753,013
Available-for-sale securities, maturing within 1 year, average yield	2.20%
Available-for-sale securities, maturing 1 to 5 years, average yield	2.42%
Available-for-sale securities, maturing 5 to 10 years, average yield	1.91%
Available-for-sale securities, maturing over 10 years, average yield	1.81%
Available-for-sale securities, total average yield	1.85%
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	1,995
Debt securities, maturing 5 to 10 years, amortized cost	2,500
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	9,850
Debt securities, total amortized cost	14,345
Amortized Cost	14,345	4,960
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	2,080
Debt securities, maturing 5 to 10 years, fair value	2,489
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	9,666
Debt securities, total fair value	14,235
Available-for-sale investment securities, at fair value (amortized cost of $839,682 at June 30, 2021 and $734,544 at December 31, 2020) (a)	14,235	5,363
States and political subdivisions
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	7,714
Debt securities, maturing 1 to 5 years, amortized cost	26,841
Debt securities, maturing 5 to 10 years, amortized cost	53,403
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	133,396
Debt securities, total amortized cost	221,354
Amortized Cost	221,354	110,401
Debt securities, maturing within 1 year, fair value	7,774
Debt securities, maturing 1 to 5 years, fair value	27,879
Debt securities, maturing 5 to 10 years, fair value	54,874
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	133,326
Debt securities, total fair value	223,853
Available-for-sale investment securities, at fair value (amortized cost of $839,682 at June 30, 2021 and $734,544 at December 31, 2020) (a)	223,853	114,919
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	1
Debt securities, maturing 1 to 5 years, amortized cost	3,652
Debt securities, maturing 5 to 10 years, amortized cost	42,869
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	524,925
Debt securities, total amortized cost	571,447
Amortized Cost	571,447	609,865
Debt securities, maturing within 1 year, fair value	1
Debt securities, maturing 1 to 5 years, fair value	3,688
Debt securities, maturing 5 to 10 years, fair value	43,101
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	532,362
Debt securities, total fair value	579,152
Available-for-sale investment securities, at fair value (amortized cost of $839,682 at June 30, 2021 and $734,544 at December 31, 2020) (a)	579,152	623,218
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	1,319
Debt securities, maturing 1 to 5 years, amortized cost	798
Debt securities, maturing 5 to 10 years, amortized cost	9,912
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	15,811
Debt securities, total amortized cost	27,840
Amortized Cost	27,840	4,622
Debt securities, maturing within 1 year, fair value	1,337
Debt securities, maturing 1 to 5 years, fair value	814
Debt securities, maturing 5 to 10 years, fair value	9,860
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	15,620
Debt securities, total fair value	27,631
Available-for-sale investment securities, at fair value (amortized cost of $839,682 at June 30, 2021 and $734,544 at December 31, 2020) (a)	27,631	4,783
Bank-issued trust preferred 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	0
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	4,766
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	0
Debt securities, total fair value	4,766
Available-for-sale investment securities, at fair value (amortized cost of $839,682 at June 30, 2021 and $734,544 at December 31, 2020) (a)	$ 4,766	$ 4,730

Available-for-sale Securities, Average Yield

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