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Allowance for Credit Losses (ACL) - Disaggregated analysis of the changes in allowance for credit losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 07, 2020
Dec. 31, 2021
Dec. 31, 2020
Allowance for credit losses      
Balance at beginning of period   $ 457,309 $ 56,927
Charge-offs   (16,899) (14,602)
Recoveries   13,800 11,777
Net (charge-offs) recoveries   (3,099) (2,825)
(Recovery) provision   (152,403) 89,923
Balance at end of period   301,807 457,309
Quantitative allowance      
Collectively evaluated   292,210 415,929
Individually evaluated   2,464 1,249
Total quantitative allowance   294,674 417,178
Qualitative allowance   7,133 40,131
Provision for credit losses   (152,403) 89,923
Unfunded Commitment      
Allowance for credit losses      
(Recovery) provision   12,900 43,400
Quantitative allowance      
Provision for credit losses   12,900 43,400
Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period   149,404 3,408
Balance at end of period     149,404
Adjustments      
Allowance for credit losses      
Balance at beginning of period   457,309 111,365
Balance at end of period     457,309
Adjustments | ASU 2016-13      
Allowance for credit losses      
Balance at beginning of period   109,442 51,030
Balance at end of period     109,442
Residential Mortgage Sr.      
Allowance for credit losses      
Balance at beginning of period   63,561 6,128
Charge-offs   (204) (528)
Recoveries   1,547 1,143
Net (charge-offs) recoveries   1,343 615
(Recovery) provision   (17,868) 4,310
Balance at end of period   47,036 63,561
Quantitative allowance      
Collectively evaluated   45,575 54,656
Individually evaluated   150 82
Total quantitative allowance   45,725 54,738
Qualitative allowance   1,311 8,823
Provision for credit losses   (17,868) 4,310
Residential Mortgage Sr. | Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period   29,935 406
Balance at end of period     29,935
Residential Mortgage Sr. | Adjustments      
Allowance for credit losses      
Balance at beginning of period   63,561 11,989
Balance at end of period     63,561
Residential Mortgage Sr. | Adjustments | ASU 2016-13      
Allowance for credit losses      
Balance at beginning of period   16,712 5,455
Balance at end of period     16,712
Residential Mortgage Jr.      
Allowance for credit losses      
Balance at beginning of period   1,238 15
Charge-offs     (24)
Recoveries   146 455
Net (charge-offs) recoveries   146 431
(Recovery) provision   (773) (252)
Balance at end of period   611 1,238
Quantitative allowance      
Collectively evaluated   611 1,238
Total quantitative allowance   611 1,238
Provision for credit losses   (773) (252)
Residential Mortgage Jr. | Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period   804 3
Balance at end of period     804
Residential Mortgage Jr. | Adjustments      
Allowance for credit losses      
Balance at beginning of period   1,238 29
Balance at end of period     1,238
Residential Mortgage Jr. | Adjustments | ASU 2016-13      
Allowance for credit losses      
Balance at beginning of period   226 11
Balance at end of period     226
HELOC      
Allowance for credit losses      
Balance at beginning of period   16,698 4,327
Charge-offs   (1,002) (1,053)
Recoveries   2,256 1,251
Net (charge-offs) recoveries   1,254 198
(Recovery) provision   (4,627) (1,311)
Balance at end of period   13,325 16,698
Quantitative allowance      
Collectively evaluated   12,954 14,625
Individually evaluated   91 77
Total quantitative allowance   13,045 14,702
Qualitative allowance   280 1,996
Provision for credit losses   (4,627) (1,311)
HELOC | Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period   5,119 289
Balance at end of period     5,119
HELOC | Adjustments      
Allowance for credit losses      
Balance at beginning of period   16,698 8,465
Balance at end of period     16,698
HELOC | Adjustments | ASU 2016-13      
Allowance for credit losses      
Balance at beginning of period   4,227 3,849
Balance at end of period     4,227
Residential Construction      
Allowance for credit losses      
Balance at beginning of period   4,914 815
Charge-offs   (29) (32)
Recoveries   60 111
Net (charge-offs) recoveries   31 79
(Recovery) provision   52 (2,954)
Balance at end of period   4,997 4,914
Quantitative allowance      
Collectively evaluated   4,989 4,733
Total quantitative allowance   4,989 4,733
Qualitative allowance   8 181
Provision for credit losses   52 (2,954)
Residential Construction | Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period   1,302  
Balance at end of period     1,302
Residential Construction | Adjustments      
Allowance for credit losses      
Balance at beginning of period   4,914 1,594
Balance at end of period     4,914
Residential Construction | Adjustments | ASU 2016-13      
Allowance for credit losses      
Balance at beginning of period   4,893 779
Balance at end of period     4,893
Other C&D      
Allowance for credit losses      
Balance at beginning of period   67,197 6,211
Charge-offs   (87) (347)
Recoveries   1,861 1,407
Net (charge-offs) recoveries   1,774 1,060
(Recovery) provision   (31,378) 40,279
Balance at end of period   37,593 67,197
Quantitative allowance      
Collectively evaluated   37,159 67,188
Individually evaluated   434 9
Total quantitative allowance   37,593 67,197
Provision for credit losses   (31,378) 40,279
Other C&D | Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period   6,035 351
Balance at end of period     6,035
Other C&D | Adjustments      
Allowance for credit losses      
Balance at beginning of period   67,197 12,150
Balance at end of period     67,197
Other C&D | Adjustments | ASU 2016-13      
Allowance for credit losses      
Balance at beginning of period   7,673 5,588
Balance at end of period     7,673
Consumer      
Allowance for credit losses      
Balance at beginning of period   26,562 4,350
Charge-offs   (8,809) (6,158)
Recoveries   2,075 1,922
Net (charge-offs) recoveries   (6,734) (4,236)
(Recovery) provision   3,321 12,333
Balance at end of period   23,149 26,562
Quantitative allowance      
Collectively evaluated   21,887 18,435
Individually evaluated     120
Total quantitative allowance   21,887 18,555
Qualitative allowance   1,262 8,007
Provision for credit losses   3,321 12,333
Consumer | Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period   6,120 669
Balance at end of period     6,120
Consumer | Adjustments      
Allowance for credit losses      
Balance at beginning of period   26,562 8,509
Balance at end of period     26,562
Consumer | Adjustments | ASU 2016-13      
Allowance for credit losses      
Balance at beginning of period   3,836 3,490
Balance at end of period     3,836
Multifamily      
Allowance for credit losses      
Balance at beginning of period   7,887 1,557
Recoveries   3 71
Net (charge-offs) recoveries   3 71
(Recovery) provision   (2,969) 2,657
Balance at end of period   4,921 7,887
Quantitative allowance      
Collectively evaluated   4,921 7,887
Total quantitative allowance   4,921 7,887
Provision for credit losses   (2,969) 2,657
Multifamily | Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period   902 97
Balance at end of period     902
Multifamily | Adjustments      
Allowance for credit losses      
Balance at beginning of period   7,887 3,045
Balance at end of period     7,887
Multifamily | Adjustments | ASU 2016-13      
Allowance for credit losses      
Balance at beginning of period   1,212 1,391
Balance at end of period     1,212
Municipal      
Allowance for credit losses      
Balance at beginning of period   1,510 956
(Recovery) provision   (945) (2,282)
Balance at end of period   565 1,510
Quantitative allowance      
Collectively evaluated   565 685
Total quantitative allowance   565 685
Qualitative allowance     825
Provision for credit losses   (945) (2,282)
Municipal | Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period   1,003  
Balance at end of period     1,003
Municipal | Adjustments      
Allowance for credit losses      
Balance at beginning of period   1,510 1,870
Balance at end of period     1,510
Municipal | Adjustments | ASU 2016-13      
Allowance for credit losses      
Balance at beginning of period   919 914
Balance at end of period     919
CRE Owner Occupied      
Allowance for credit losses      
Balance at beginning of period   97,104 10,879
Charge-offs   (2,052) (1,205)
Recoveries   970 1,089
Net (charge-offs) recoveries   (1,082) (116)
(Recovery) provision   (34,228) 16,468
Balance at end of period   61,794 97,104
Quantitative allowance      
Collectively evaluated   60,353 91,106
Individually evaluated   590 948
Total quantitative allowance   60,943 92,054
Qualitative allowance   851 5,050
Provision for credit losses   (34,228) 16,468
CRE Owner Occupied | Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period   34,077 898
Balance at end of period     34,077
CRE Owner Occupied | Adjustments      
Allowance for credit losses      
Balance at beginning of period   97,104 21,282
Balance at end of period     97,104
CRE Owner Occupied | Adjustments | ASU 2016-13      
Allowance for credit losses      
Balance at beginning of period   25,393 9,505
Balance at end of period     25,393
Non Owner Occupied CRE      
Allowance for credit losses      
Balance at beginning of period   124,421 15,219
Charge-offs   (863) (601)
Recoveries   1,070 518
Net (charge-offs) recoveries   207 (83)
(Recovery) provision   (44,979) 13,877
Balance at end of period   79,649 124,421
Quantitative allowance      
Collectively evaluated   77,494 116,571
Individually evaluated   196 6
Total quantitative allowance   77,690 116,577
Qualitative allowance   1,959 7,844
Provision for credit losses   (44,979) 13,877
Non Owner Occupied CRE | Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period   45,787 656
Balance at end of period     45,787
Non Owner Occupied CRE | Adjustments      
Allowance for credit losses      
Balance at beginning of period   124,421 29,773
Balance at end of period     124,421
Non Owner Occupied CRE | Adjustments | ASU 2016-13      
Allowance for credit losses      
Balance at beginning of period   35,067 13,898
Balance at end of period     35,067
C & I      
Allowance for credit losses      
Balance at beginning of period   46,217 6,470
Charge-offs   (3,853) (4,654)
Recoveries   3,812 3,810
Net (charge-offs) recoveries   (41) (844)
(Recovery) provision   (18,009) 6,798
Balance at end of period   28,167 46,217
Quantitative allowance      
Collectively evaluated   25,702 38,805
Individually evaluated   1,003 7
Total quantitative allowance   26,705 38,812
Qualitative allowance   1,462 7,405
Provision for credit losses   (18,009) 6,798
C & I | Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period   18,320 39
Balance at end of period     18,320
C & I | Adjustments      
Allowance for credit losses      
Balance at beginning of period   46,217 12,659
Balance at end of period     46,217
C & I | Adjustments | ASU 2016-13      
Allowance for credit losses      
Balance at beginning of period   $ 9,284 6,150
Balance at end of period     9,284
CSFL      
Allowance for credit losses      
Charge-offs $ (158,200)    
CSFL | Unfunded Commitment      
Allowance for credit losses      
(Recovery) provision     9,600
Quantitative allowance      
Provision for credit losses     $ 9,600