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Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details)
Sep. 30, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Number  of Securities    
Less than 12 months | security 233 152
12 months or longer | security 110 20
Total | security 343 172
Fair  Value    
Less than 12 months $ 791,689,000 $ 1,764,910,000
12 months or longer 1,196,726,000 174,593,000
Total 1,988,415,000 1,939,503,000
Gross Unrealized Losses    
Less than 12 months (81,750,000) (29,377,000)
12 months or longer (246,606,000) (6,262,000)
Total $ (328,356,000) $ (35,639,000)
Collateralized mortgage obligations    
Number  of Securities    
Less than 12 months | security 87 39
12 months or longer | security 36 2
Total | security 123 41
Fair  Value    
Less than 12 months $ 213,800,000 $ 757,799,000
12 months or longer 605,594,000 37,438,000
Total 819,394,000 795,237,000
Gross Unrealized Losses    
Less than 12 months (23,090,000) (15,445,000)
12 months or longer (126,644,000) (1,025,000)
Total (149,734,000) $ (16,470,000)
Allowance for credit losses for available for sale securities 0  
Mortgage-backed securities    
Gross Unrealized Losses    
Allowance for credit losses for available for sale securities $ 0  
Mortgage-backed securities: Residential    
Number  of Securities    
Less than 12 months | security 31 49
12 months or longer | security 34 13
Total | security 65 62
Fair  Value    
Less than 12 months $ 102,932,000 $ 603,372,000
12 months or longer 353,658,000 75,211,000
Total 456,590,000 678,583,000
Gross Unrealized Losses    
Less than 12 months (16,266,000) (9,371,000)
12 months or longer (83,141,000) (2,503,000)
Total $ (99,407,000) $ (11,874,000)
Mortgage-backed securities: Commercial    
Number  of Securities    
Less than 12 months | security 42 24
12 months or longer | security 13 4
Total | security 55 28
Fair  Value    
Less than 12 months $ 259,911,000 $ 214,384,000
12 months or longer 119,704,000 57,656,000
Total 379,615,000 272,040,000
Gross Unrealized Losses    
Less than 12 months (23,430,000) (3,339,000)
12 months or longer (23,438,000) (2,021,000)
Total $ (46,868,000) $ (5,360,000)
Corporate securities    
Number  of Securities    
Less than 12 months | security 1 4
12 months or longer | security 5 1
Total | security 6 5
Fair  Value    
Less than 12 months $ 3,533,000 $ 14,067,000
12 months or longer 15,182,000 4,288,000
Total 18,715,000 18,355,000
Gross Unrealized Losses    
Less than 12 months (467,000) (331,000)
12 months or longer (4,180,000) (713,000)
Total (4,647,000) $ (1,044,000)
Allowance for credit losses for available for sale securities $ 0  
Municipal securities    
Number  of Securities    
Less than 12 months | security 61 23
12 months or longer | security 13 0
Total | security 74 23
Fair  Value    
Less than 12 months $ 131,751,000 $ 59,403,000
12 months or longer 30,683,000 0
Total 162,434,000 59,403,000
Gross Unrealized Losses    
Less than 12 months (13,514,000) (767,000)
12 months or longer (4,317,000) 0
Total $ (17,831,000) $ (767,000)
U.S. Government Agency and U.S. Government Sponsored Enterprises    
Gross Unrealized Losses    
Percentage of portfolio 85.00%  
Asset-backed Securities    
Number  of Securities    
Less than 12 months | security 9 13
12 months or longer | security 9 0
Total | security 18 13
Fair  Value    
Less than 12 months $ 71,998,000 $ 115,885,000
12 months or longer 71,905,000 0
Total 143,903,000 115,885,000
Gross Unrealized Losses    
Less than 12 months (4,759,000) (124,000)
12 months or longer (4,886,000) 0
Total $ (9,645,000) $ (124,000)
US Treasury Notes Securities    
Number  of Securities    
Less than 12 months | security 1  
12 months or longer | security 0  
Total | security 1  
Fair  Value    
Less than 12 months $ 3,889,000  
12 months or longer 0  
Total 3,889,000  
Gross Unrealized Losses    
Less than 12 months (99,000)  
12 months or longer 0  
Total $ (99,000)  
Agency Securities    
Number  of Securities    
Less than 12 months | security 1  
12 months or longer | security 0  
Total | security 1  
Fair  Value    
Less than 12 months $ 3,875,000  
12 months or longer 0  
Total 3,875,000  
Gross Unrealized Losses    
Less than 12 months (125,000)  
12 months or longer 0  
Total $ (125,000)