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Investment Securities - Other-Than-Temporary Impairment (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
security
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Investment securities      
Total OTTI write-downs included in earnings     $ (24,085,000)
Number of securities intended to sell or sold | security 48 0 48
Amortized cost of securities intended to sell     $ 898,200,000
Additional loss from sale of securities $ 2,600,000    
Expected credit losses in debt securities   $ 0 0
OTTI related to credit losses   $ 0 0
U.S. Treasury securities      
Investment securities      
Total OTTI write-downs included in earnings     (13,634,000)
Government-sponsored enterprises debt securities      
Investment securities      
Total OTTI write-downs included in earnings     (1,344,000)
Residential - Government agency      
Investment securities      
Total OTTI write-downs included in earnings     (146,000)
Residential - Government-sponsored enterprises      
Investment securities      
Total OTTI write-downs included in earnings     (763,000)
Government agency      
Investment securities      
Total OTTI write-downs included in earnings     (5,064,000)
Government-sponsored enterprises      
Investment securities      
Total OTTI write-downs included in earnings     (2,711,000)
Debt securities issued by states and political subdivisions      
Investment securities      
Total OTTI write-downs included in earnings     $ (423,000)