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Goodwill, Core Deposit Premium and Other Intangible Assets (Mortgage and commercial loans servicing) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Valuation servicing rights in tranches [Line Items]          
Mortgage loans serviced for others $ 4,200,000,000   $ 4,200,000,000   $ 4,060,000,000
Custodial escrow balances maintained 23,600,000   23,600,000   19,200,000
Loans serviced 35,654,000   35,654,000   34,926,000
Valuation allowance         0
Mortgage Servicing Rights          
Valuation servicing rights in tranches [Line Items]          
Servicing asset at amortized value 39,881,000 $ 36,971,000 $ 39,881,000 $ 36,971,000 $ 40,900,000
Prepayment rate     11.84%   10.65%
Discount rate     9.27%   9.25%
Fees collected for servicing of mortgage loans 3,000,000 2,600,000 $ 5,900,000 $ 5,000,000  
Mortgage Servicing Rights | Minimum          
Valuation servicing rights in tranches [Line Items]          
Average cap rate     0.88% 0.65%  
Mortgage Servicing Rights | Maximum          
Valuation servicing rights in tranches [Line Items]          
Average cap rate     1.35% 1.38%  
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 4,791,000 4,429,000 $ 4,791,000 $ 4,429,000  
Fees collected for servicing of mortgage loans 375,000 $ 360,000 455,000 $ 360,000  
Loans serviced 179,000,000   $ 179,000,000    
Commercial Servicing Rights | Minimum          
Valuation servicing rights in tranches [Line Items]          
Prepayment rate     6.92%   7.33%
Discount rate     11.68%   12.35%
Average cap rate     0.031% 0.018%  
Commercial Servicing Rights | Maximum          
Valuation servicing rights in tranches [Line Items]          
Prepayment rate     7.67%   8.10%
Discount rate     12.68%   13.49%
Average cap rate     0.0445% 0.0445%  
Commercial Servicing Rights Less Than 20 Years          
Valuation servicing rights in tranches [Line Items]          
Servicing asset at amortized value 1,147,000   $ 1,147,000   $ 1,297,000
Servicing asset, agreement term     20 years    
Valuation allowance     $ 8,000   0
Commercial Servicing Rights More Than 20 Years          
Valuation servicing rights in tranches [Line Items]          
Servicing asset at amortized value $ 3,644,000   $ 3,644,000   3,605,000
Servicing asset, agreement term     20 years    
Valuation allowance     $ 38,000   $ 0