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Debt Securities Available-for-Sale - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
security
Jun. 30, 2017
USD ($)
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale securities pledged to secure borrowings and deposits | $ $ 441,200,000   $ 441,200,000  
Proceeds from sale of debt securities available-for-sale | $ 10,100,000 $ 967,000 29,608,000 $ 967,000
Gross realized gains on sales of securities available-for-sale | $ 116,000 0 176,000 0
Gross realized losses on sales of securities available-for-sale | $ 0 4,000 5,000 4,000
Recognized gains (losses) on trading securities portfolio | $ 197,000 260,000 302,000 668,000
Impairment charges against earnings | $ $ 0 $ 0 $ 0 $ 0
Continuous Unrealized Loss Position 12 Months Or Longer | Non-GSE | Real Estate Mortgage Investment Conduits (REMICs)        
Schedule of Available-for-sale Securities [Line Items]        
Number of securities (securities) | security     1  
Continuous Unrealized Loss Position Less Than 12 Months | Corporate bonds | Real Estate Mortgage Investment Conduits (REMICs)        
Schedule of Available-for-sale Securities [Line Items]        
Number of securities (securities) | security     13  
Pass Through | Continuous Unrealized Loss Position 12 Months Or Longer | GSE | Real Estate Mortgage Investment Conduits (REMICs)        
Schedule of Available-for-sale Securities [Line Items]        
Number of securities (securities) | security     33  
Pass Through | Continuous Unrealized Loss Position Less Than 12 Months | GSE | Pass-through Certificates        
Schedule of Available-for-sale Securities [Line Items]        
Number of securities (securities) | security     40  
Non Pass Through | Continuous Unrealized Loss Position 12 Months Or Longer | GSE | Real Estate Mortgage Investment Conduits (REMICs)        
Schedule of Available-for-sale Securities [Line Items]        
Number of securities (securities) | security     19  
Non Pass Through | Continuous Unrealized Loss Position Less Than 12 Months | GSE | Real Estate Mortgage Investment Conduits (REMICs)        
Schedule of Available-for-sale Securities [Line Items]        
Number of securities (securities) | security     37