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Fair Value (Reconciliation of assets and liabilities using significant unobservable inputs (Level 3)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Sale of Mortgage Servicing Rights $ 0 $ (5,927) $ 0
Fair Value, Measurements, Recurring [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance 7,531 14,070 34,175
Gains (losses) included in earnings (104) (187) (1,216)
Sale of Mortgage Servicing Rights   (5,927)  
Changes in fair value of investment securities available for sale included in other comprehensive income     320
New instruments acquired 2,616 2,620 2,149
Change due to principal payments (489) (1,017) (21,072)
Amortization 28 185 600
Changes in fair value related to pricr of MSRs held for sale   (2,939) 320
Changes in fair value of servicing assets 276 726 (886)
Balance 9,858 7,531 14,070
Fair Value, Measurements, Recurring [Member] | Other Debt Obligations [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance 0 0 19,680
Gains (losses) included in earnings 0 0 0
Sale of Mortgage Servicing Rights   0  
Changes in fair value of investment securities available for sale included in other comprehensive income     320
New instruments acquired   0 0
Change due to principal payments 0 0 (20,000)
Amortization   0 0
Changes in fair value related to pricr of MSRs held for sale   0  
Changes in fair value of servicing assets 0 0 0
Balance 0 0 0
Fair Value, Measurements, Recurring [Member] | Derivative Financial Instruments, Assets [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance 1,171 5,555 16,430
Gains (losses) included in earnings (1,171) (4,384) (10,875)
Sale of Mortgage Servicing Rights   0  
Changes in fair value of investment securities available for sale included in other comprehensive income     0
New instruments acquired 0 0 0
Change due to principal payments 0 0 0
Amortization 0 0 0
Changes in fair value related to pricr of MSRs held for sale   0  
Changes in fair value of servicing assets 0 0 0
Balance 0 1,171 5,555
Fair Value, Measurements, Recurring [Member] | Servicing Assets [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance 7,455 13,992 13,801
Gains (losses) included in earnings 0 0 0
Sale of Mortgage Servicing Rights   (5,927)  
Changes in fair value of investment securities available for sale included in other comprehensive income     0
New instruments acquired 2,616 2,620 2,149
Change due to principal payments (489) (1,017) (1,072)
Amortization 0 0 0
Changes in fair value related to pricr of MSRs held for sale   (2,939)  
Changes in fair value of servicing assets 276 726 (886)
Balance 9,858 7,455 13,992
Fair Value, Measurements, Recurring [Member] | Derivative Financial Instruments, Liabilities [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance (1,095) (5,477) (15,736)
Gains (losses) included in earnings 1,067 4,197 9,659
Sale of Mortgage Servicing Rights   0  
Changes in fair value of investment securities available for sale included in other comprehensive income     0
New instruments acquired 0 0 0
Change due to principal payments 0 0 0
Amortization 28 185 600
Changes in fair value related to pricr of MSRs held for sale   0  
Changes in fair value of servicing assets 0 0 0
Balance $ 0 $ (1,095) $ (5,477)