XML 74 R63.htm IDEA: XBRL DOCUMENT v3.10.0.1
Investment Securities (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Schedule of Investments [Line Items]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   21.00%    
Investment Securities average remaining life   4 years 11 months 5 days    
Available-for-sale Securities, Gross Realized Losses   $ 2,600,000    
Debt securities held-to-maturity, at amortized cost (fair value of $348,192 and $363,779 at June 30, 2018 and December 31, 2017, respectively) $ 351,431,000 351,431,000   $ 357,197,000
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss)   $ 291,000    
percent of held to securities sold paid down 96.30% 96.30%    
Other than Temporary Impairment Losses, Investments $ 0 $ 0 $ 0  
Available-for-sale Securities, Gross Realized Gains     $ 0.000  
Asset backed securities mortgage portfolio, term   15 years    
Available-for-sale securities 1,127,511,000 $ 1,127,511,000   1,097,645,000
Securities sold at a gain [Member]        
Schedule of Investments [Line Items]        
Available-for-sale securities 246,961,000 246,961,000    
Securities sold at a gain [Member]        
Schedule of Investments [Line Items]        
Debt securities held-to-maturity, at amortized cost (fair value of $348,192 and $363,779 at June 30, 2018 and December 31, 2017, respectively) 7,400,000 7,400,000    
U.S. Government Sponsored Entities Asset-Backed Securities [Member]        
Schedule of Investments [Line Items]        
Debt securities held-to-maturity, at amortized cost (fair value of $348,192 and $363,779 at June 30, 2018 and December 31, 2017, respectively) 47,192,000 47,192,000   56,785,000
Collateral Pledged [Member]        
Schedule of Investments [Line Items]        
Debt Securities, Available-for-sale, Restricted $ 618,000,000 $ 618,000,000   $ 557,000,000