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Goodwill, Core Deposit Premium and Other Intangible Assets (Mortgage and commercial loans servicing) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Valuation servicing rights in tranches [Line Items]          
Mortgage loans serviced for others $ 3,560,000,000   $ 3,560,000,000   $ 4,310,000,000
Custodial escrow balances maintained 24,300,000   24,300,000   21,400,000
Total net loans receivable held to maturity 773,900,000        
Amount derecognized 6,900,000        
Proceeds from sale of mortgage servicing rights 5,100,000   5,137,000 $ 0  
Gain (loss) on sale of portfolio     (183,000)    
Receivable recorded 1,600,000   1,600,000    
Loans serviced 26,599,000   26,599,000   35,778,000
Mortgage Servicing Rights          
Valuation servicing rights in tranches [Line Items]          
Servicing asset at amortized value 35,000,000 $ 38,127,000 35,000,000 38,127,000 $ 45,200,000
Amount derecognized     $ 6,940,000 0  
Prepayment rate     10.93%   9.63%
Discount rate     9.06%   9.26%
Fees collected for servicing of mortgage loans 2,900,000 3,100,000 $ 9,300,000 $ 9,000,000  
Mortgage Servicing Rights | Minimum          
Valuation servicing rights in tranches [Line Items]          
Average cap rate     0.91% 0.88%  
Mortgage Servicing Rights | Maximum          
Valuation servicing rights in tranches [Line Items]          
Average cap rate     1.50% 1.35%  
Mortgage Servicing Rights 15-year Tranche          
Valuation servicing rights in tranches [Line Items]          
Servicing asset, agreement term     15 years    
Mortgage Servicing Rights 30-year Tranche          
Valuation servicing rights in tranches [Line Items]          
Servicing asset, agreement term     30 years    
Commercial Servicing Rights          
Valuation servicing rights in tranches [Line Items]          
Servicing asset at amortized value 3,458,000 4,397,000 $ 3,458,000 $ 4,397,000 $ 4,100,000
Fees collected for servicing of mortgage loans     1,200,000 $ 685,000  
Loans serviced 144,400,000   $ 144,400,000   $ 164,600,000
Commercial Servicing Rights | Minimum          
Valuation servicing rights in tranches [Line Items]          
Prepayment rate     6.66%   6.96%
Discount rate     12.52%   12.44%
Average cap rate     3.10% 3.10%  
Commercial Servicing Rights | Maximum          
Valuation servicing rights in tranches [Line Items]          
Prepayment rate     7.99%   7.88%
Discount rate     14.65%   13.88%
Average cap rate     4.45% 4.45%  
Commercial Servicing Rights Less Than 20 Years          
Valuation servicing rights in tranches [Line Items]          
Servicing asset at amortized value 827,000   $ 827,000   $ 1,200,000
Servicing asset, agreement term     20 years    
Fees collected for servicing of mortgage loans 394,000 $ 230,000      
Valuation allowance     $ 0   0
Commercial Servicing Rights More Than 20 Years          
Valuation servicing rights in tranches [Line Items]          
Servicing asset at amortized value $ 2,631,000   $ 2,631,000   2,927,000
Servicing asset, agreement term     20 years    
Valuation allowance     $ 4,000   $ 33,000