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Investment Securities - Unrealized Gross Losses and Fair Values of Securities in a Continuous Loss Position (Details)
$ in Thousands
Sep. 30, 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 90 154
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses $ (1,056) $ (1)
12 Months or More Unrealized Losses (12,617) (142,161)
Total Unrealized Losses (13,673) (142,162)
Time in Continuous Loss, Fair Value    
Less Than 12 Months Fair Value 540,128 172
12 Months or More Fair Value 1,109,559 3,619,406
Total Fair Value 1,649,687 3,619,578
Government-sponsored enterprises debt securities    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (75)  
12 Months or More Unrealized Losses   (6,778)
Total Unrealized Losses (75) (6,778)
Time in Continuous Loss, Fair Value    
Less Than 12 Months Fair Value 24,917  
12 Months or More Fair Value   157,939
Total Fair Value 24,917 157,939
Government agency mortgage-backed securities    
Time in Continuous Loss, Unrealized Losses    
12 Months or More Unrealized Losses (1,159) (15,174)
Total Unrealized Losses (1,159) (15,174)
Time in Continuous Loss, Fair Value    
12 Months or More Fair Value 115,069 373,891
Total Fair Value 115,069 373,891
Government-sponsored enterprises mortgage-backed securities    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses   (1)
12 Months or More Unrealized Losses (1,228) (5,293)
Total Unrealized Losses (1,228) (5,294)
Time in Continuous Loss, Fair Value    
Less Than 12 Months Fair Value   172
12 Months or More Fair Value 115,456 125,869
Total Fair Value 115,456 126,041
Collateralized mortgage obligations: Government agency    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (820)  
12 Months or More Unrealized Losses (6,517) (97,171)
Total Unrealized Losses (7,337) (97,171)
Time in Continuous Loss, Fair Value    
Less Than 12 Months Fair Value 407,961  
12 Months or More Fair Value 652,211 2,475,532
Total Fair Value 1,060,172 2,475,532
Collateralized mortgage obligations: Government-sponsored enterprises    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (161)  
12 Months or More Unrealized Losses (3,713) (17,745)
Total Unrealized Losses (3,874) (17,745)
Time in Continuous Loss, Fair Value    
Less Than 12 Months Fair Value 107,250  
12 Months or More Fair Value 226,823 486,175
Total Fair Value $ 334,073 $ 486,175