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Financial Instruments with Off-Balance Sheet Risk (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
Entity Information [Line Items]  
Credit Extension Commitments $ 1,596,930
Credit Extension Commitments, Beyond One Year 416,411
Standby Letters of Credit  
Entity Information [Line Items]  
Credit Extension Commitments 50,022
Unused Credit Card Lines  
Entity Information [Line Items]  
Credit Extension Commitments $ 550,354