Fair Value (Carrying Amounts and Estimated Fair Values of Company's Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financial Assets:
Loans, Net	$ 2,136,086	$ 2,125,944
FHLB Stock and Other Restricted Stock	13,048	13,048
Financial Liabilities:
Time Deposits	(402,597)	(387,885)
Level 1
Financial Assets:
Cash and Short-term Investments	32,023	48,467
Loans, Net	0	0	[1]
Accrued Interest Receivable	0	0
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(2,064,524)	(1,096,167)
Time Deposits	0	0
Short-term Borrowings	0	0
Long-term Debt	0	0
Accrued Interest Payable	0	0
Level 2
Financial Assets:
Cash and Short-term Investments	8,187	16,349
Loans, Net	0	0	[1]
Accrued Interest Receivable	3,885	3,574
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	(401,234)	(388,640)
Short-term Borrowings	(142,796)	(133,499)
Long-term Debt	(118,619)	(129,366)
Accrued Interest Payable	(886)	(1,042)
Level 3
Financial Assets:
Cash and Short-term Investments	0	0
Loans, Net	2,099,154	2,120,154	[1]
Accrued Interest Receivable	9,748	9,684
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	0	0
Short-term Borrowings	0	0
Long-term Debt	(10,709)	(11,052)
Accrued Interest Payable	(66)	(16)
Carrying Value
Financial Assets:
Cash and Short-term Investments	40,210	70,359
Loans, Net	2,129,993	2,119,152	[1]
FHLB Stock and Other Restricted Stock	13,048	13,048
Accrued Interest Receivable	13,633	13,258
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(2,064,524)	(2,096,167)
Time Deposits	(402,597)	(387,885)
Short-term Borrowings	(142,796)	(133,499)
Long-term Debt	(131,677)	(141,717)
Accrued Interest Payable	(952)	(1,058)
Total
Financial Assets:
Cash and Short-term Investments	40,210	64,816
Loans, Net	2,099,154	2,120,154	[1]
Accrued Interest Receivable	13,633	13,258
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(2,064,524)	(1,096,167)
Time Deposits	(401,234)	(388,640)
Short-term Borrowings	(142,796)	(133,499)
Long-term Debt	(129,328)	(140,418)
Accrued Interest Payable	$ (952)	$ (1,058)

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