Fair Value of Financial Instruments (Fair Values of Financial Assets and Liabilities on Balance Sheets) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financial assets:
Cash and cash equivalents	$ 121,449	$ 77,612
Held-to-maturity investment securities, at amortized cost (fair value of $34,893 at September 30, 2019 and $36,963 at December 31, 2018)	33,829	36,961
Held-to-maturity investment securities at fair value	34,893	36,963
Federal Home Loan Bank (FHLB) stock	27,716	29,367
Federal Reserve Bank (FRB) stock	13,310	12,294
Other investment securities	42,727	42,708
Net loans	3,146,439	2,907,537
Loans held for sale	4,522	5,470
Loans held for sale	4,824	5,492
Bank owned life insurance	70,396	68,934
Servicing Asset	3,439	4,568
Financial liabilities:
Deposits, Fair Value Disclosure	3,377,795	2,953,452
Short-term Debt, Fair Value	289,776	349,994
Long-term Debt, Fair Value	84,261	107,696
Carrying Amount
Financial assets:
Held-to-maturity investment securities, at amortized cost (fair value of $34,893 at September 30, 2019 and $36,963 at December 31, 2018)	33,829	36,961
Other investment securities	42,727	42,708
Net loans	2,828,731	2,708,583
Servicing Asset	2,684	2,655
Financial liabilities:
Deposits, Fair Value Disclosure	3,357,202	2,955,465
Short-term Debt, Fair Value	288,150	356,198
Long-term Debt, Fair Value	84,194	109,644
States and political subdivisions
Financial assets:
Held-to-maturity investment securities at fair value	4,897	4,896
States and political subdivisions | Carrying Amount
Financial assets:
Held-to-maturity investment securities, at amortized cost (fair value of $34,893 at September 30, 2019 and $36,963 at December 31, 2018)	4,395	4,403
Residential mortgage-backed securities
Financial assets:
Held-to-maturity investment securities at fair value	22,608	28,603
Residential mortgage-backed securities | Carrying Amount
Financial assets:
Held-to-maturity investment securities, at amortized cost (fair value of $34,893 at September 30, 2019 and $36,963 at December 31, 2018)	22,412	29,044
Commercial mortgage-backed securities
Financial assets:
Held-to-maturity investment securities at fair value	7,388	3,464
Commercial mortgage-backed securities | Carrying Amount
Financial assets:
Held-to-maturity investment securities, at amortized cost (fair value of $34,893 at September 30, 2019 and $36,963 at December 31, 2018)	7,022	3,514
Nonqualified Plan [Member]
Financial assets:
Other investment securities	1,336	987
Nonqualified Plan [Member] | Carrying Amount
Financial assets:
Other investment securities	1,336	987
Other Security Investments [Member]
Financial assets:
Other investment securities	$ 365	$ 60