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Securities - HTM in an Unrealized Loss Position (Details)
$ in Thousands
Mar. 31, 2023
USD ($)
item
Dec. 31, 2022
USD ($)
item
Number of Securities    
Unrealized loss for less than twelve months | item 49 212
Unrealized loss for twelve months or longer | item 243 97
Total | item 292 309
Fair Value    
Unrealized loss for less than twelve months $ 29,871 $ 315,556
Unrealized loss for twelve months or longer 741,894 466,222
Total 771,765 781,778
Unrealized Losses    
Unrealized loss for less than twelve months 483 28,998
Unrealized loss for twelve months or longer 76,555 61,225
Total $ 77,038 $ 90,223
Residential Mortgage Backed Securities    
Number of Securities    
Unrealized loss for less than twelve months | item   14
Unrealized loss for twelve months or longer | item 45 31
Total | item 45 45
Fair Value    
Unrealized loss for less than twelve months   $ 59,089
Unrealized loss for twelve months or longer $ 270,038 212,768
Total 270,038 271,857
Unrealized Losses    
Unrealized loss for less than twelve months   5,928
Unrealized loss for twelve months or longer 25,852 23,799
Total $ 25,852 $ 29,727
Commercial Mortgage Backed Securities    
Number of Securities    
Unrealized loss for less than twelve months | item 3 30
Unrealized loss for twelve months or longer | item 28 1
Total | item 31 31
Fair Value    
Unrealized loss for less than twelve months $ 10,788 $ 163,172
Unrealized loss for twelve months or longer 157,137 2,834
Total 167,925 166,006
Unrealized Losses    
Unrealized loss for less than twelve months 311 14,483
Unrealized loss for twelve months or longer 12,362 452
Total $ 12,673 $ 14,935
Collateralized Mortgage Obligations    
Number of Securities    
Unrealized loss for less than twelve months | item   18
Unrealized loss for twelve months or longer | item 54 38
Total | item 54 56
Fair Value    
Unrealized loss for less than twelve months   $ 33,836
Unrealized loss for twelve months or longer $ 273,963 242,527
Total 273,963 276,363
Unrealized Losses    
Unrealized loss for less than twelve months   3,225
Unrealized loss for twelve months or longer 33,815 35,118
Total $ 33,815 $ 38,343
US States and Political Subdivisions Debt Securities    
Number of Securities    
Unrealized loss for less than twelve months | item 46 150
Unrealized loss for twelve months or longer | item 116 27
Total | item 162 177
Fair Value    
Unrealized loss for less than twelve months $ 19,083 $ 59,459
Unrealized loss for twelve months or longer 40,756 8,093
Total 59,839 67,552
Unrealized Losses    
Unrealized loss for less than twelve months 172 5,362
Unrealized loss for twelve months or longer 4,526 1,856
Total $ 4,698 $ 7,218