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Loans, Allowance for Credit Losses, and Credit Quality (Details Textuals) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans and Leases Receivable, Allowance $ 261,538   $ 261,538   $ 266,302 $ 268,315
Recorded Investment 5,383 $ 5,014 14,742 $ 17,415    
Restructured Loans Subsequently Accruing 3,000   3,000      
YTD Restructured Loans Still On Nonaccrual 12,000   12,000      
Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans and Leases Receivable, Allowance 115,309   115,309   116,025 $ 104,501
Commercial Portfolio Segment [Member] | Oil and Gas Industry [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans and Leases Receivable, Allowance $ 26,000   $ 26,000   $ 17,000  
Allocated allowance for loan losses, percent 3.43%   3.43%   2.26%