Financial Instruments with Off-Balance Sheet Risk (Loan Commitments and Standby Letters of Credit) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Loan Commitments and Standby Letters of Credit [Line Items]
Contractual Loan Commitments	$ 15,000	$ 15,000
Unused Commitments to Extend Credit	473,768	395,316
Standby letters of credit	25,651	22,970
Home equity lines of credit
Loan Commitments and Standby Letters of Credit [Line Items]
Contractual Loan Commitments	85,024	84,148
Construction Loans [Member]
Loan Commitments and Standby Letters of Credit [Line Items]
Contractual Loan Commitments	119,075	77,479
Other loan commitments
Loan Commitments and Standby Letters of Credit [Line Items]
Contractual Loan Commitments	$ 269,669	$ 233,689