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Loans and Allowance for Credit Losses Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Receivables [Abstract]        
Allowance for loan losses $ 170,076 $ 168,679 $ 163,841 $ 169,054
Reserve for unfunded lending commitments 2,571 2,646    
Allowance for credit losses $ 172,647 $ 171,325 $ 166,065 $ 171,412