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Investment Securities - Unrealized Gross Losses and Fair Values of Securities in a Continuous Loss Position (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Securities in the available-for-sale portfolio in a continuous loss position    
Number of individual securities in a continuous loss position | security 118 154
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses $ (9,658) $ (1)
12 Months or More Unrealized Losses (14,329) (142,161)
Total Unrealized Losses (23,987) (142,162)
Time in Continuous Loss, Fair Value    
Less Than 12 Months Fair Value 1,314,806 172
12 Months or More Fair Value 994,155 3,619,406
Total Fair Value 2,308,961 3,619,578
Government-sponsored enterprises debt securities    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (277)  
12 Months or More Unrealized Losses   (6,778)
Total Unrealized Losses (277) (6,778)
Time in Continuous Loss, Fair Value    
Less Than 12 Months Fair Value 49,716  
12 Months or More Fair Value   157,939
Total Fair Value 49,716 157,939
Residential - Government agency    
Time in Continuous Loss, Unrealized Losses    
12 Months or More Unrealized Losses (1,146) (15,174)
Total Unrealized Losses (1,146) (15,174)
Time in Continuous Loss, Fair Value    
12 Months or More Fair Value 109,614 373,891
Total Fair Value 109,614 373,891
Residential - Government-sponsored enterprises    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (115) (1)
12 Months or More Unrealized Losses (1,558) (5,293)
Total Unrealized Losses (1,673) (5,294)
Time in Continuous Loss, Fair Value    
Less Than 12 Months Fair Value 76,481 172
12 Months or More Fair Value 109,025 125,869
Total Fair Value 185,506 126,041
Commercial - Government-sponsored enterprises    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (634)  
Total Unrealized Losses (634)  
Time in Continuous Loss, Fair Value    
Less Than 12 Months Fair Value 38,062  
Total Fair Value 38,062  
Government agency    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (8,049)  
12 Months or More Unrealized Losses (8,299) (97,171)
Total Unrealized Losses (16,348) (97,171)
Time in Continuous Loss, Fair Value    
Less Than 12 Months Fair Value 969,762  
12 Months or More Fair Value 565,764 2,475,532
Total Fair Value 1,535,526 2,475,532
Government-sponsored enterprises    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (583)  
12 Months or More Unrealized Losses (3,326) (17,745)
Total Unrealized Losses (3,909) (17,745)
Time in Continuous Loss, Fair Value    
Less Than 12 Months Fair Value 180,785  
12 Months or More Fair Value 209,752 486,175
Total Fair Value $ 390,537 $ 486,175