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Fair Value (Reconciliation of assets and liabilities using significant unobservable inputs (Level 3)) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance $ 9,858 $ 7,531 $ 14,070
Gains (losses) included in earnings   (104) (187)
Sale of Mortgage Servicing Rights     (5,927)
New instruments acquired 1,658 2,616 2,620
Change due to principal payments (590) (489) (1,017)
Amortization   28 185
Changes in fair value related to pricr of MSRs held for sale     (2,939)
Changes in fair value of servicing assets (1,105) 276 726
Balance 9,821 9,858 7,531
Derivative Financial Instruments, Assets [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance 0 1,171 5,555
Gains (losses) included in earnings   (1,171) (4,384)
Sale of Mortgage Servicing Rights     0
New instruments acquired   0 0
Change due to principal payments   0 0
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
Balance   0 1,171
Servicing Assets [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance 9,858 7,455 13,992
Gains (losses) included in earnings   0 0
Sale of Mortgage Servicing Rights     (5,927)
New instruments acquired 1,658 2,616 2,620
Change due to principal payments (590) (489) (1,017)
Amortization   0 0
Changes in fair value related to pricr of MSRs held for sale     (2,939)
Changes in fair value of servicing assets (1,105) 276 726
Balance 9,821 9,858 7,455
Derivative Financial Instruments, Liabilities [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance $ 0 (1,095) (5,477)
Gains (losses) included in earnings   1,067 4,197
Sale of Mortgage Servicing Rights     0
New instruments acquired   0 0
Change due to principal payments   0 0
Amortization   28 185
Changes in fair value related to pricr of MSRs held for sale     0
Changes in fair value of servicing assets   0 0
Balance   $ 0 $ (1,095)