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Commitments and Contingent Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Obligations to extend credit for loan commitments $ 957,088 $ 978,189
Loan commitments    
Obligations to extend credit for loan commitments 125,472 200,316
Standby letters of credit    
Obligations to extend credit for loan commitments 57,723 58,639
Undisbursed portion of lines of credit    
Obligations to extend credit for loan commitments $ 773,893 $ 719,234