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Investment Securities (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Schedule of Investments [Line Items]          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00%    
Available-for-sale Securities, Gross Realized Losses $ 67,000   $ 692,000 $ 2,600,000  
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax (39,000)   88,000 538,000  
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 at December 31, 2018)         $ 351,808,000
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss)       291,000  
Debt securities, held to maturity, realized gain (loss), tax       $ 61,000  
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 253,000   $ 271,000 60,000  
Asset backed securities mortgage portfolio, term     15 years    
Debt Securities, Held-to-maturity, Transfer, Amount 373,900,000   $ 349,773,000 0  
Debt Securities, Available-for-sale, Amortized Cost 1,237,990,000   1,237,990,000   1,028,883,000
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax 19,095,000 $ 0 19,095,000 0  
Securities sold at a gain [Member]          
Schedule of Investments [Line Items]          
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 14,000   145,000 551,000  
Debt Securities, Available-for-sale, Amortized Cost 62,400,000 245,000,000.0 62,400,000 245,000,000.0  
Securities sold at a gain [Member] | QTD Sold [Member]          
Schedule of Investments [Line Items]          
Debt Securities, Available-for-sale, Amortized Cost 10,700,000   10,700,000    
Securities sold at a gain [Member]          
Schedule of Investments [Line Items]          
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 53,000   57,000 13,000  
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 at December 31, 2018)   7,400,000   7,400,000  
Debt Securities, Available-for-sale, Amortized Cost 29,100,000 $ 2,000,000.0 29,100,000 $ 2,000,000.0  
Securities sold at a gain [Member] | QTD Sold [Member]          
Schedule of Investments [Line Items]          
Debt Securities, Available-for-sale, Amortized Cost 23,800,000   23,800,000    
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 $351,422 at December 31, 2018)         46,530,000
Debt Securities, Available-for-sale, Amortized Cost 934,468,000   934,468,000   1,028,883,000
Collateral Pledged [Member]          
Schedule of Investments [Line Items]          
Debt Securities, Available-for-sale, Restricted $ 574,000,000   $ 574,000,000   $ 634,000,000