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Derivative Financial Instruments, Effect on Statement of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain Recognized in Other Comprehensive Income (Loss) (Effective Portion) $ 327 $ 0 $ 1,011 $ 0
Cash Flow Hedge [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain Recognized in Other Comprehensive Income (Loss) (Effective Portion) 327 0 1,011 0
Gain Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) 53 0 59 0
Gain (Loss) Recognized in Income [1] (24) 0 (12) 0
Cash Flow Hedge [Member] | Interest-Rate Cap Agreements [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain Recognized in Other Comprehensive Income (Loss) (Effective Portion) 244 0 757 0
Cash Flow Hedge [Member] | Interest-Rate Cap Agreements [Member] | Interest Expense [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) 45 0 52 0
Gain (Loss) Recognized in Income [1] 0 0 0 0
Cash Flow Hedge [Member] | Fixed Income Interest Rate [Member] | Interest Rate Swap [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain Recognized in Other Comprehensive Income (Loss) (Effective Portion) 83 0 254 0
Cash Flow Hedge [Member] | Fixed Income Interest Rate [Member] | Interest Rate Swap [Member] | Interest Expense [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) 8 0 7 0
Gain (Loss) Recognized in Income [1] (24) 0 (12) 0
No Hedge Designation [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain (Loss) Recognized in Income 170 255 438 (170)
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 244 65 672 436
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 (110) 190 (270) (606)
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 (6) (35) (99) 34
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 6 35 99 (34)
No Hedge Designation [Member] | Fixed Income Interest Rate [Member] | Interest Rate Swap - Commercial [Member] | Interest Income [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain (Loss) Recognized in Income 487 (359) 1,543 (249)
No Hedge Designation [Member] | Variable Income Interest Rate [Member] | Interest Rate Swap - Commercial [Member] | Interest Income [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain (Loss) Recognized in Income (487) 359 (1,543) 249
No Hedge Designation [Member] | Variable Income Interest Rate [Member] | Interest Rate Swap [Member] | Interest Expense [Member]        
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]        
Gain (Loss) Recognized in Income $ 36 $ 0 $ 36 $ 0
[1] For cash flow hedges, this location and amount refers to the ineffective portion.