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Impairment of Investment Securities - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt and Equity Securities, FV-NI [Line Items]          
Other than temporary impairment charges recognized     $ 0 $ 0  
Amortized Cost $ 861,812,000   861,812,000   $ 924,054,000
Securities available for sale, at fair value 865,903,000   865,903,000   909,247,000
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 5,649,000   5,649,000   28,054,000
Federal Home Loan Bank Stock $ 27,900,000   $ 27,900,000   30,500,000
Other Investments and Securities, at Cost         1,700,000
Investment Securities in Unrealized Loss Position, Qualitative Disclosure, Number of Positions, Total 57   57    
Corporate Debt Securities [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Securities available for sale, at fair value $ 23,934,000   $ 23,934,000   21,012,000
Equity Securities [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Other than temporary impairment charges recognized $ 0 $ 0      
Continuous Unrealized Loss Position, Fair Value         0
US Government-sponsored Enterprises Debt Securities [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Percent of Unrealized Losses 87.00%   87.00%    
US Government Agencies Debt Securities [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Percent of Unrealized Losses 13.00%   13.00%    
Corporate Debt Securities [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Amortized Cost $ 22,908,000   $ 22,908,000   20,912,000
Securities available for sale, at fair value $ 23,934,000   $ 23,934,000   $ 21,012,000
Investment Securities in Unrealized Loss Position, Qualitative Disclosure, Number of Positions, Total 0   0   4