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Fair Value Measurements (Carrying Values of Assets Measured at Estimated Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value of Financial Instruments    
Total securities available-for-sale $ 356,347 $ 416,798
Total residential mortgage-backed securities    
Fair Value of Financial Instruments    
Total securities available-for-sale 301,296 344,857
GSE issuance REMICs and CMOs    
Fair Value of Financial Instruments    
Total securities available-for-sale 288,812 330,539
Non-GSE issuance REMICs and CMOs    
Fair Value of Financial Instruments    
Total securities available-for-sale 2,217 3,054
GSE pass-through certificates    
Fair Value of Financial Instruments    
Total securities available-for-sale 10,267 11,264
Obligations of GSEs    
Fair Value of Financial Instruments    
Total securities available-for-sale 55,049 71,939
Fannie Mae stock    
Fair Value of Financial Instruments    
Total securities available-for-sale 2 2
Recurring basis    
Fair Value of Financial Instruments    
Total securities available-for-sale 356,347 416,798
Recurring basis | GSE issuance REMICs and CMOs    
Fair Value of Financial Instruments    
Total securities available-for-sale 288,812 330,539
Recurring basis | Non-GSE issuance REMICs and CMOs    
Fair Value of Financial Instruments    
Total securities available-for-sale 2,217 3,054
Recurring basis | GSE pass-through certificates    
Fair Value of Financial Instruments    
Total securities available-for-sale 10,267 11,264
Recurring basis | Obligations of GSEs    
Fair Value of Financial Instruments    
Total securities available-for-sale 55,049 71,939
Recurring basis | Fannie Mae stock    
Fair Value of Financial Instruments    
Total securities available-for-sale 2 2
Recurring basis | Level 1    
Fair Value of Financial Instruments    
Total securities available-for-sale 2 2
Recurring basis | Level 1 | GSE issuance REMICs and CMOs    
Fair Value of Financial Instruments    
Total securities available-for-sale 0 0
Recurring basis | Level 1 | Non-GSE issuance REMICs and CMOs    
Fair Value of Financial Instruments    
Total securities available-for-sale 0 0
Recurring basis | Level 1 | GSE pass-through certificates    
Fair Value of Financial Instruments    
Total securities available-for-sale 0 0
Recurring basis | Level 1 | Obligations of GSEs    
Fair Value of Financial Instruments    
Total securities available-for-sale 0 0
Recurring basis | Level 1 | Fannie Mae stock    
Fair Value of Financial Instruments    
Total securities available-for-sale 2 2
Recurring basis | Level 2    
Fair Value of Financial Instruments    
Total securities available-for-sale 356,345 416,796
Recurring basis | Level 2 | GSE issuance REMICs and CMOs    
Fair Value of Financial Instruments    
Total securities available-for-sale 288,812 330,539
Recurring basis | Level 2 | Non-GSE issuance REMICs and CMOs    
Fair Value of Financial Instruments    
Total securities available-for-sale 2,217 3,054
Recurring basis | Level 2 | GSE pass-through certificates    
Fair Value of Financial Instruments    
Total securities available-for-sale 10,267 11,264
Recurring basis | Level 2 | Obligations of GSEs    
Fair Value of Financial Instruments    
Total securities available-for-sale 55,049 71,939
Recurring basis | Level 2 | Fannie Mae stock    
Fair Value of Financial Instruments    
Total securities available-for-sale $ 0 $ 0