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Derivative Financial Instruments, Effect on Statement of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Cash Flow Hedge [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain Recognized in Other Comprehensive Income (Effective Portion) $ 95 $ 0 $ 95 $ 0
Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) (5) 0 (5) 0
Gain (Loss) Recognized in Income [1] 5 0 5 0
Cash Flow Hedge [Member] | Pay-fixed Interest Rate Swap [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain Recognized in Other Comprehensive Income (Effective Portion) 95 0 95 0
Cash Flow Hedge [Member] | Pay-fixed Interest Rate Swap [Member] | Interest Expense [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) (5) 0 (5) 0
Gain (Loss) Recognized in Income [1] 5 0 5 0
No Hedge Designation [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain (Loss) Recognized in Income [1] (311) 358 (481) 261
No Hedge Designation [Member] | Rate-Lock Mortgage Loan Commitments [Member] | Net Gains on Mortgage Loans [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain (Loss) Recognized in Income [1] (313) 264 123 613
No Hedge Designation [Member] | Mandatory Commitments to Sell Mortgage Loans [Member] | Net Gains on Mortgage Loans [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain (Loss) Recognized in Income [1] 2 94 (604) (352)
No Hedge Designation [Member] | Pay-fixed Interest Rate Swap [Member] | Interest Income [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain (Loss) Recognized in Income [1] 52 196 (197) (1,512)
No Hedge Designation [Member] | Pay-variable Interest Rate Swap [Member] | Interest Income [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain (Loss) Recognized in Income [1] (52) (196) 197 1,512
No Hedge Designation [Member] | Purchased Options [Member] | Interest Expense [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain (Loss) Recognized in Income [1] 5 13 39 94
No Hedge Designation [Member] | Written Options [Member] | Interest Expense [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain (Loss) Recognized in Income [1] $ (5) $ (13) $ (39) $ (94)
[1] For cash flow hedges, this location and amount refers to the ineffective portion.