Fair Value of Financial Instruments (Fair Values of Financial Assets and Liabilities on Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financial assets:
Cash and Cash Equivalents, Fair Value Disclosure	$ 82,072	$ 77,612
Held-to-maturity investment securities, at amortized cost (fair value of $36,066 at March 31, 2019 and $36,963 at December 31, 2018)	35,606	36,961
Held-to-maturity investment securities at fair value	36,066	36,963
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	27,586	29,367
Federal Reserve Bank Stock	12,294	12,294
Other Investments	41,150	42,708
Loans Receivable and Loans Held-for-sale, Fair Value Disclosure	2,884,562	2,907,537
Loans held for sale	2,191	5,470
Loans held for sale	2,069	5,492
Bank owned life insurance	69,419	68,934
Financial liabilities:
Deposits, Fair Value Disclosure	3,149,980	2,953,452
Short-term Debt, Fair Value	191,259	349,994
Long-term Debt, Fair Value	104,285	107,696
Carrying Amount
Financial assets:
Held-to-maturity investment securities, at amortized cost (fair value of $36,066 at March 31, 2019 and $36,963 at December 31, 2018)	35,606	36,961
Other Investments	41,150	42,708
Loans Receivable and Loans Held-for-sale, Fair Value Disclosure	2,716,641	2,708,583
Servicing Asset	2,507	2,655
Financial liabilities:
Deposits, Fair Value Disclosure	3,137,413	2,955,465
Short-term Debt, Fair Value	191,363	356,198
Long-term Debt, Fair Value	105,995	109,644
States and political subdivisions
Financial assets:
Held-to-maturity investment securities at fair value	4,965	4,896
States and political subdivisions | Carrying Amount
Financial assets:
Held-to-maturity investment securities, at amortized cost (fair value of $36,066 at March 31, 2019 and $36,963 at December 31, 2018)	4,401	4,403
U.S. Treasury and government agencies
Financial assets:
Other Investments	1,210	987
Servicing Asset	3,973	4,568
U.S. Treasury and government agencies | Carrying Amount
Financial assets:
Other Investments	1,210	987
Residential mortgage-backed securities
Financial assets:
Held-to-maturity investment securities at fair value	28,276	28,603
Residential mortgage-backed securities | Carrying Amount
Financial assets:
Held-to-maturity investment securities, at amortized cost (fair value of $36,066 at March 31, 2019 and $36,963 at December 31, 2018)	28,348	29,044
Commercial mortgage-backed securities
Financial assets:
Held-to-maturity investment securities at fair value	2,825	3,464
Commercial mortgage-backed securities | Carrying Amount
Financial assets:
Held-to-maturity investment securities, at amortized cost (fair value of $36,066 at March 31, 2019 and $36,963 at December 31, 2018)	2,857	3,514
United Banker's Bancorporation Inc [Member]
Financial assets:
Other Investments	$ 60	$ 60