Commitments and Contingencies - Schedule Of Financial Instruments With Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Commitments to originate commercial or real estate construction loans and unused lines of credit granted to customers
Commitments
Financial Instruments With Off-Balance Sheet Risk	$ 887,627	$ 855,484
Commitments to originate consumer loans - personal lines of credit and equity lines
Commitments
Financial Instruments With Off-Balance Sheet Risk	41,376	35,446
Overdraft protection plans
Commitments
Financial Instruments With Off-Balance Sheet Risk	22,919	17,127
Letters of credit
Commitments
Financial Instruments With Off-Balance Sheet Risk	26,631	30,313
Unfunded commitments for unconsolidated investments
Commitments
Financial Instruments With Off-Balance Sheet Risk	6,664	6,351
Company guarantees
Commitments
Financial Instruments With Off-Balance Sheet Risk	3,127	$ 2,950
Commitments For Unconsolidated Investments
Commitments
Financial Instruments With Off-Balance Sheet Risk	11,500
Unfunded commitments	$ 6,700