Commitments, Guarantees, and Contingent Liabilities (Details) - Contractual or Notional Amounts of Financial Instruments - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Other Commitments [Line Items]
Letters of credit		$ 100,430	$ 100,610
Recourse on assets sold:
Unpaid principal balance of loans sold		187,158	196,389
Carrying value of recourse obligation	[1]	142	87
Commitments to extend credit
Other Commitments [Line Items]
Commercial, industrial, and agricultural		1,522,152	1,303,056
Commercial real estate		397,423	366,250
Home equity		426,384	352,114
Other commitments	[2]	214,943	203,121
Total commitments to extend credit		$ 2,560,902	$ 2,224,541

[1] Included in other liabilities in the Consolidated Statements of Financial Condition.

[2] Other commitments includes installment and overdraft protection program commitments.