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Securities, AFS Securities in Continuous Unrealized Loss Position (Details) $ in Thousands | Jun. 30, 2022 USD ($) Position | Dec. 31, 2021 USD ($) Position
--- | --- | ---
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 1,172,064 | $ 811,115
12 months or longer | 436,219 | 253,578
Total | 1,608,283 | 1,064,693
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (83,271) | (13,238)
12 months or longer | (60,249) | (8,704)
Total | $ (143,520) | $ (21,942)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 320 | 127
12 months or longer | Position | 53 | 22
Total | Position | 373 | 149
AIR on AFS debt securities | $ 4,100 | $ 3,900
U.S. Treasury [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | 115,177 | 49,105
12 months or longer | 0 | 0
Total | 115,177 | 49,105
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (7,392) | (6)
12 months or longer | 0 | 0
Total | $ (7,392) | $ (6)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 7 | 2
12 months or longer | Position | 0 | 0
Total | Position | 7 | 2
Federal Agency [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 2,448 | $ 41,618
12 months or longer | 214,984 | 198,313
Total | 217,432 | 239,931
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (398) | (1,846)
12 months or longer | (30,606) | (6,677)
Total | $ (31,004) | $ (8,523)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 1 | 4
12 months or longer | Position | 15 | 12
Total | Position | 16 | 16
State & Municipal [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 73,635 | $ 87,515
12 months or longer | 13,541 | 0
Total | 87,176 | 87,515
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (8,489) | (1,559)
12 months or longer | (1,884) | 0
Total | $ (10,373) | $ (1,559)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 57 | 61
12 months or longer | Position | 10 | 0
Total | Position | 67 | 61
Mortgage-Backed [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 347,683 | $ 281,217
12 months or longer | 172,189 | 39,491
Total | 519,872 | 320,708
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (18,428) | (4,319)
12 months or longer | (23,391) | (1,525)
Total | $ (41,819) | $ (5,844)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 139 | 24
12 months or longer | Position | 19 | 6
Total | Position | 158 | 30
Collateralized Mortgage Obligations [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 579,941 | $ 341,673
12 months or longer | 35,505 | 15,774
Total | 615,446 | 357,447
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (45,744) | (5,495)
12 months or longer | (4,368) | (502)
Total | $ (50,112) | $ (5,997)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 100 | 34
12 months or longer | Position | 9 | 4
Total | Position | 109 | 38
Corporate [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 53,180 | $ 9,987
12 months or longer | 0 | 0
Total | 53,180 | 9,987
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (2,820) | (13)
12 months or longer | 0 | 0
Total | $ (2,820) | $ (13)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 16 | 2
12 months or longer | Position | 0 | 0
Total | Position | 16 | 2

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