Fair Value of Financial Instruments (Fair Values of Financial Assets and Liabilities on Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Carrying Amount
Financial assets:
Cash and cash equivalents	$ 66,146	$ 71,115
Investment securities	859,455	868,830
Loans (1)	2,210,529	2,057,614
Financial liabilities:
Deposits	2,509,722	2,535,944
Short-term borrowings		160,386
Long-term borrowings	145,155	113,670
Portion at Fair Value Measurement [Member]
Financial assets:
Cash and cash equivalents	66,146	71,115
Investment securities	859,538	868,955
Loans (1)	2,152,544	2,018,482
Financial liabilities:
Deposits	2,512,647	2,540,131
Short-term borrowings	305,607	160,386
Long-term borrowings	145,106	117,299
Interest Rate Cash Flow Hedge Liability at Fair Value	$ 1,779	$ 0