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Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details)
 6 Months Ended
Jun. 30, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Number of Securities    
Less than 12 months | security 0 21
12 months or longer | security 108 198
Total | security 108 219
Fair Value    
Less than 12 months $ 0 $ 72,036,000
12 months or longer 839,240,000 1,422,127,000
Total 839,240,000 1,494,163,000
Gross Unrealized Losses    
Less than 12 months 0 (366,000)
12 months or longer (10,720,000) (49,997,000)
Total (10,720,000) $ (50,363,000)
Collateralized mortgage obligations    
Gross Unrealized Losses    
12 months or longer (3,100,000)  
OTTI recognized $ 0  
Collateralized mortgage obligations    
Number of Securities    
Less than 12 months | security 0 1
12 months or longer | security 56 93
Total | security 56 94
Fair Value    
Less than 12 months $ 0 $ 8,041,000
12 months or longer 360,072,000 700,095,000
Total 360,072,000 708,136,000
Gross Unrealized Losses    
Less than 12 months 0 (28,000)
12 months or longer (3,120,000) (21,101,000)
Total $ (3,120,000) $ (21,129,000)
Residential    
Number of Securities    
Less than 12 months | security 0 4
12 months or longer | security 37 45
Total | security 37 49
Fair Value    
Less than 12 months $ 0 $ 19,973,000
12 months or longer 309,942,000 363,334,000
Total 309,942,000 383,307,000
Gross Unrealized Losses    
Less than 12 months 0 (37,000)
12 months or longer (3,213,000) (13,064,000)
Total $ (3,213,000) $ (13,101,000)
Commercial    
Number of Securities    
Less than 12 months | security 0 3
12 months or longer | security 11 27
Total | security 11 30
Fair Value    
Less than 12 months $ 0 $ 38,494,000
12 months or longer 147,737,000 312,428,000
Total 147,737,000 350,922,000
Gross Unrealized Losses    
Less than 12 months 0 (218,000)
12 months or longer (2,712,000) (12,761,000)
Total $ (2,712,000) $ (12,979,000)
Corporate securities    
Number of Securities    
Less than 12 months | security 0 0
12 months or longer | security 1 1
Total | security 1 1
Fair Value    
Less than 12 months $ 0 $ 0
12 months or longer 3,881,000 3,826,000
Total 3,881,000 3,826,000
Gross Unrealized Losses    
Less than 12 months 0 0
12 months or longer (1,120,000) (1,174,000)
Total $ (1,120,000) $ (1,174,000)
Municipal securities    
Number of Securities    
Less than 12 months | security 0 13
12 months or longer | security 3 32
Total | security 3 45
Fair Value    
Less than 12 months $ 0 $ 5,528,000
12 months or longer 17,608,000 42,444,000
Total 17,608,000 47,972,000
Gross Unrealized Losses    
Less than 12 months 0 (83,000)
12 months or longer (555,000) (1,897,000)
Total (555,000) $ (1,980,000)
OTTI recognized 0  
Mortgage-backed securities    
Gross Unrealized Losses    
12 months or longer (5,900,000)  
OTTI recognized $ 0