Fair Value of Financial Instruments (Fair Values of Financial Assets and Liabilities on Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financial assets:
Cash and cash equivalents	$ 132,262	$ 61,454
Investment securities	822,342	713,633
Loans	1,962,441	1,581,813
Financial liabilities:
Deposits	2,550,034	1,938,021
Short-term borrowings	92,711	88,277
Long-term borrowings	134,188	183,878
Carrying Amount
Financial assets:
Cash and cash equivalents	132,262	61,454
Investment securities	822,199	713,659
Loans	1,997,983	1,607,391
Financial liabilities:
Deposits	2,544,572	1,933,074
Short-term borrowings	92,711	88,277
Long-term borrowings	$ 128,633	$ 179,083