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Fair Value - Assets and liabilities measured at fair value on a recurring basis - (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Assets          
Loans held for sale $ 34,933 $ 87,342 $ 41,649    
Securities available for sale 978,047 808,396 1,009,541    
Government-sponsored entities debt          
Assets          
Securities available for sale 126,313 134,203 162,507    
State and municipal obligations          
Assets          
Securities available for sale 128,143 136,516 131,364    
Common Stock          
Assets          
Securities available for sale 3,761 3,253 3,821    
Significant Other Observable Inputs (Level 2)          
Assets          
Loans held for sale 34,933 87,342 41,649    
Significant Unobservable Inputs (Level 3)          
Assets          
Mortgage servicing rights 23,697 21,510 26,202    
Changes in fair value of assets          
Changes in hierarchy classifications of Level 3 liabilities 0        
Recurring basis          
Assets          
Derivative financial instruments 3,439 3,160 1,415    
Loans held for sale 34,933 87,342 41,649    
Securities available for sale 978,047 808,396 1,009,541    
Mortgage servicing rights 23,697 21,510 26,202    
Fair value of Assets, Total 1,040,116 920,408 1,078,807    
Liabilities          
Derivative financial instruments 1,408 1,608 838    
Recurring basis | Government-sponsored entities debt          
Assets          
Securities available for sale 126,313 134,203 162,507    
Recurring basis | State and municipal obligations          
Assets          
Securities available for sale 128,143 136,516 131,364    
Recurring basis | Mortgage-backed securities          
Assets          
Securities available for sale 719,830 534,424 711,849    
Recurring basis | Common Stock          
Assets          
Securities available for sale 3,761 3,253 3,821    
Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1)          
Assets          
Securities available for sale 2,536 3,028 2,596    
Fair value of Assets, Total 2,536 3,028 2,596    
Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1) | Common Stock          
Assets          
Securities available for sale 2,536 3,028 2,596    
Recurring basis | Significant Other Observable Inputs (Level 2)          
Assets          
Derivative financial instruments 3,439 3,160 1,415    
Loans held for sale 34,933 87,342 41,649    
Securities available for sale 975,511 805,368 1,006,945    
Fair value of Assets, Total 1,013,883 895,870 1,050,009    
Liabilities          
Derivative financial instruments 1,408 1,608 838    
Recurring basis | Significant Other Observable Inputs (Level 2) | Government-sponsored entities debt          
Assets          
Securities available for sale 126,313 134,203 162,507    
Recurring basis | Significant Other Observable Inputs (Level 2) | State and municipal obligations          
Assets          
Securities available for sale 128,143 136,516 131,364    
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities          
Assets          
Securities available for sale 719,830 534,424 711,849    
Recurring basis | Significant Other Observable Inputs (Level 2) | Common Stock          
Assets          
Securities available for sale 1,225 225 1,225    
Recurring basis | Significant Unobservable Inputs (Level 3)          
Assets          
Mortgage servicing rights 23,697 21,510 26,202    
Fair value of Assets, Total 23,697 21,510 $ 26,202    
Changes in fair value of assets          
Fair value of assets at the beginning of the period 26,202 21,601      
Servicing assets that resulted from transfers of financial assets (881) (1,582)      
Fair value of assets at the end of the period 23,697 21,510      
Changes in fair value assets due to valuation inputs or assumptions (2,606) (836)      
Changes in fair value assets due to increased principal paydowns $ 780 $ 837      
Unrealized losses included in accumulated other comprehensive income related to Level 3 financial assets and liabilities       $ 0 $ 0