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Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]    
Number of Securities, Less than 12 months | security 21 94
Number of Securities, 12 months or longer | security 198 90
Number of Securities, Total | security 219 184
Fair Value - Less than 12 months $ 72,036 $ 829,310
Fair Value - 12 months or longer 1,422,127 787,873
Fair Value - Total 1,494,163 1,617,183
Gross Unrealized Losses - Less than 12 months (366) (9,542)
Gross Unrealized Losses - 12 months or longer (49,997) (23,546)
Gross Unrealized Losses - Total $ (50,363) $ (33,088)
Collateralized Mortgage Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Number of Securities, Less than 12 months | security 1 38
Number of Securities, 12 months or longer | security 93 53
Number of Securities, Total | security 94 91
Fair Value - Less than 12 months $ 8,041 $ 425,198
Fair Value - 12 months or longer 700,095 408,526
Fair Value - Total 708,136 833,724
Gross Unrealized Losses - Less than 12 months (28) (5,954)
Gross Unrealized Losses - 12 months or longer (21,101) (11,588)
Gross Unrealized Losses - Total $ (21,129) $ (17,542)
Mortgage-backed Securities, Residential    
Schedule of Available-for-sale Securities [Line Items]    
Number of Securities, Less than 12 months | security 4 20
Number of Securities, 12 months or longer | security 45 23
Number of Securities, Total | security 49 43
Fair Value - Less than 12 months $ 19,973 $ 195,086
Fair Value - 12 months or longer 363,334 230,616
Fair Value - Total 383,307 425,702
Gross Unrealized Losses - Less than 12 months (37) (1,282)
Gross Unrealized Losses - 12 months or longer (13,064) (5,701)
Gross Unrealized Losses - Total $ (13,101) $ (6,983)
Mortgage-backed Securities, Commercial    
Schedule of Available-for-sale Securities [Line Items]    
Number of Securities, Less than 12 months | security 3 16
Number of Securities, 12 months or longer | security 27 8
Number of Securities, Total | security 30 24
Fair Value - Less than 12 months $ 38,494 $ 186,357
Fair Value - 12 months or longer 312,428 115,008
Fair Value - Total 350,922 301,365
Gross Unrealized Losses - Less than 12 months (218) (1,614)
Gross Unrealized Losses - 12 months or longer (12,761) (5,067)
Gross Unrealized Losses - Total $ (12,979) $ (6,681)
Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Number of Securities, Less than 12 months | security 13 18
Number of Securities, 12 months or longer | security 32 3
Number of Securities, Total | security 45 21
Fair Value - Less than 12 months $ 5,528 $ 9,295
Fair Value - 12 months or longer 42,444 22,144
Fair Value - Total 47,972 31,439
Gross Unrealized Losses - Less than 12 months (83) (69)
Gross Unrealized Losses - 12 months or longer (1,897) (806)
Gross Unrealized Losses - Total $ (1,980) $ (875)
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Number of Securities, Less than 12 months | security 0 1
Number of Securities, 12 months or longer | security 1 0
Number of Securities, Total | security 1 1
Fair Value - Less than 12 months $ 0 $ 4,475
Fair Value - 12 months or longer 3,826 0
Fair Value - Total 3,826 4,475
Gross Unrealized Losses - Less than 12 months 0 (522)
Gross Unrealized Losses - 12 months or longer (1,174) 0
Gross Unrealized Losses - Total $ (1,174) $ (522)
Mutual funds    
Schedule of Available-for-sale Securities [Line Items]    
Number of Securities, Less than 12 months | security   1
Number of Securities, 12 months or longer | security   3
Number of Securities, Total | security   4
Fair Value - Less than 12 months   $ 8,899
Fair Value - 12 months or longer   11,579
Fair Value - Total   20,478
Gross Unrealized Losses - Less than 12 months   (101)
Gross Unrealized Losses - 12 months or longer   (384)
Gross Unrealized Losses - Total   $ (485)