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Securities - AFS and HTM, Amortized Cost and FV (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2022
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Available for sale        
Amortized cost   $ 1,753,205   $ 2,148,635
Unrealized Gains   406   13,570
Unrealized Losses   (168,887)   (31,637)
Fair Value   1,584,724   2,130,568
Held to maturity        
Amortized cost   889,452   267,684
Unrealized Gains   1   8,615
Unrealized Losses   (96,894)   (3)
Held to maturity, fair value   792,559   276,296
Equity Securities        
Unrealized net gains from equity securities   100   200
Equity, at fair value   209   250
Book value of held to maturity   689,477    
Pre-tax net unrecognized losses   67,798    
Recognized net loss on equity securities   100 $ 100  
US Treasury Securities        
Available for sale        
Amortized cost   24,958   14,937
Unrealized Losses   (696)   (75)
Fair Value   24,262   14,862
Bonds        
Available for sale        
Amortized cost   115,633   43,448
Unrealized Gains   315   838
Unrealized Losses   (814)   (153)
Fair Value   115,134   44,133
Residential Mortgage Backed Securities        
Available for sale        
Amortized cost   474,451   900,084
Unrealized Gains   20   7,979
Unrealized Losses   (55,751)   (9,617)
Fair Value   418,720   898,446
Held to maturity        
Amortized cost   308,102   9,892
Unrealized Gains       400
Unrealized Losses   (34,442)    
Held to maturity, fair value   273,660   10,292
Commercial Mortgage Backed Securities        
Available for sale        
Amortized cost   199,537   219,460
Unrealized Gains       367
Unrealized Losses   (34,699)   (9,128)
Fair Value   164,838   210,699
Held to maturity        
Amortized cost   181,259   145,742
Unrealized Gains       5,311
Unrealized Losses   (15,197)    
Held to maturity, fair value   166,062   151,053
Collateralized Mortgage Obligations        
Available for sale        
Amortized cost   898,449   926,783
Unrealized Gains       2,547
Unrealized Losses   (72,099)   (12,464)
Fair Value   826,350   916,866
Held to maturity        
Amortized cost   323,526   43,990
Unrealized Gains       476
Unrealized Losses   (36,664)    
Held to maturity, fair value   286,862   44,466
US States and Political Subdivisions Debt Securities        
Available for sale        
Amortized cost   40,177   43,923
Unrealized Gains   71   1,839
Unrealized Losses   (4,828)   (200)
Fair Value   35,420   45,562
Held to maturity        
Amortized cost   76,565   68,060
Unrealized Gains   1   2,428
Unrealized Losses   (10,591)   (3)
Held to maturity, fair value   $ 65,975   $ 70,485
Agency Issued Securities        
Equity Securities        
Book value of held to maturity $ 782,000      
Market value of held to maturity 708,000      
Pre-tax net unrecognized losses $ 74,000