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Goodwill, Core Deposit Premium and Other Intangible Assets (Carrying amount of intangible assets (incl accumulated amortization) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 79,440 $ 60,071
Accumulated Amortization 30,745 26,139
Net Carrying Amount 48,695 33,932
Core deposit intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 29,138 21,069
Accumulated Amortization 14,572 12,525
Net Carrying Amount 14,566 8,544
Mortgage servicing rights    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 44,166 37,825
Accumulated Amortization 14,566 12,841
Net Carrying Amount 29,600 24,984
Customer relationship intangible    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,177 1,177
Accumulated Amortization 805 773
Net Carrying Amount 372 404
Commercial servicing rights    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 4,959 0
Accumulated Amortization 802 0
Net Carrying Amount $ 4,157 $ 0