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Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details)
Jun. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Number  of Securities    
Less than 12 months | security 45 150
12 months or longer | security 287 179
Total | security 332 329
Fair  Value    
Less than 12 months $ 141,862,000 $ 488,959,000
12 months or longer 1,730,025,000 1,443,090,000
Total 1,871,887,000 1,932,049,000
Gross Unrealized Losses    
Less than 12 months (5,125,000) (37,420,000)
12 months or longer (313,105,000) (280,662,000)
Total $ (318,230,000) $ (318,082,000)
Collateralized mortgage obligations    
Number  of Securities    
Less than 12 months | security 6 61
12 months or longer | security 112 59
Total | security 118 120
Fair  Value    
Less than 12 months $ 14,563,000 $ 150,419,000
12 months or longer 737,177,000 643,280,000
Total 751,740,000 793,699,000
Gross Unrealized Losses    
Less than 12 months (1,078,000) (14,888,000)
12 months or longer (152,030,000) (138,954,000)
Total (153,108,000) $ (153,842,000)
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 2 23
12 months or longer | security 63 42
Total | security 65 65
Fair  Value    
Less than 12 months $ 5,062,000 $ 55,645,000
12 months or longer 430,086,000 397,532,000
Total 435,148,000 453,177,000
Gross Unrealized Losses    
Less than 12 months (266,000) (5,616,000)
12 months or longer (86,731,000) (85,291,000)
Total $ (86,997,000) $ (90,907,000)
Mortgage-backed securities: Commercial    
Number  of Securities    
Less than 12 months | security 8 29
12 months or longer | security 48 26
Total | security 56 55
Fair  Value    
Less than 12 months $ 48,910,000 $ 172,963,000
12 months or longer 303,941,000 195,324,000
Total 352,851,000 368,287,000
Gross Unrealized Losses    
Less than 12 months (2,633,000) (12,156,000)
12 months or longer (52,488,000) (36,798,000)
Total $ (55,121,000) $ (48,954,000)
Corporate securities    
Number  of Securities    
Less than 12 months | security 0 1
12 months or longer | security 6 5
Total | security 6 6
Fair  Value    
Less than 12 months $ 0 $ 3,401,000
12 months or longer 18,572,000 15,456,000
Total 18,572,000 18,857,000
Gross Unrealized Losses    
Less than 12 months 0 (600,000)
12 months or longer (4,754,000) (3,894,000)
Total (4,754,000) $ (4,494,000)
Allowance for credit losses for available for sale securities $ 0  
Municipal securities    
Number  of Securities    
Less than 12 months | security 29 31
12 months or longer | security 38 32
Total | security 67 63
Fair  Value    
Less than 12 months $ 73,327,000 $ 76,942,000
12 months or longer 82,766,000 65,730,000
Total 156,093,000 142,672,000
Gross Unrealized Losses    
Less than 12 months (1,148,000) (3,207,000)
12 months or longer (13,055,000) (10,506,000)
Total $ (14,203,000) $ (13,713,000)
U.S. Government Agency and U.S. Government Sponsored Enterprises    
Gross Unrealized Losses    
Percentage of portfolio 83.10%  
Asset-backed Securities    
Number  of Securities    
Less than 12 months | security 0 3
12 months or longer | security 18 15
Total | security 18 18
Fair  Value    
Less than 12 months $ 0 $ 21,836,000
12 months or longer 149,742,000 125,768,000
Total 149,742,000 147,604,000
Gross Unrealized Losses    
Less than 12 months 0 (716,000)
12 months or longer (3,794,000) (5,219,000)
Total $ (3,794,000) $ (5,935,000)
US Treasury Notes Securities    
Number  of Securities    
Less than 12 months | security 0 1
12 months or longer | security 1 0
Total | security 1 1
Fair  Value    
Less than 12 months $ 0 $ 3,886,000
12 months or longer 3,904,000 0
Total 3,904,000 3,886,000
Gross Unrealized Losses    
Less than 12 months 0 (104,000)
12 months or longer (90,000) 0
Total $ (90,000) $ (104,000)
Agency Securities    
Number  of Securities    
Less than 12 months | security 0 1
12 months or longer | security 1 0
Total | security 1 1
Fair  Value    
Less than 12 months $ 0 $ 3,867,000
12 months or longer 3,837,000 0
Total 3,837,000 3,867,000
Gross Unrealized Losses    
Less than 12 months 0 (133,000)
12 months or longer (163,000) 0
Total $ (163,000) $ (133,000)