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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, 2020
Allowance for credit losses    
Balance at beginning of period   $ 56,927
Charge-offs   (14,602)
Recoveries   11,777
Net charge-offs   (2,825)
Provision (benefit)   89,923
Balance at end of period   457,309
Quantitative allowance    
Collectively evaluated   415,929
Individually evaluated   1,249
Total quantitative allowance   417,178
Qualitative allowance   40,131
Provision for loan losses charged to operations   89,923
Unfunded Commitment    
Allowance for credit losses    
Provision (benefit)   43,400
Quantitative allowance    
Provision for loan losses charged to operations   43,400
Initial PCD Allowance    
Allowance for credit losses    
Balance at beginning of period   3,408
Balance at end of period   149,404
Adjustments    
Allowance for credit losses    
Balance at beginning of period   111,365
Balance at end of period    
Adjustments | ASU 2016-13    
Allowance for credit losses    
Balance at beginning of period   51,030
Balance at end of period   109,442
Residential Mortgage Sr.    
Allowance for credit losses    
Balance at beginning of period   6,128
Charge-offs   (528)
Recoveries   1,143
Net charge-offs   615
Provision (benefit)   4,310
Balance at end of period   63,561
Quantitative allowance    
Collectively evaluated   54,656
Individually evaluated   82
Total quantitative allowance   54,738
Qualitative allowance   8,823
Provision for loan losses charged to operations   4,310
Residential Mortgage Sr. | Initial PCD Allowance    
Allowance for credit losses    
Balance at beginning of period   406
Balance at end of period   29,935
Residential Mortgage Sr. | Adjustments    
Allowance for credit losses    
Balance at beginning of period   11,989
Balance at end of period    
Residential Mortgage Sr. | Adjustments | ASU 2016-13    
Allowance for credit losses    
Balance at beginning of period   5,455
Balance at end of period   16,712
Residential Mortgage Jr.    
Allowance for credit losses    
Balance at beginning of period   15
Charge-offs   (24)
Recoveries   455
Net charge-offs   431
Provision (benefit)   (252)
Balance at end of period   1,238
Quantitative allowance    
Collectively evaluated   1,238
Total quantitative allowance   1,238
Provision for loan losses charged to operations   (252)
Residential Mortgage Jr. | Initial PCD Allowance    
Allowance for credit losses    
Balance at beginning of period   3
Balance at end of period   804
Residential Mortgage Jr. | Adjustments    
Allowance for credit losses    
Balance at beginning of period   29
Balance at end of period    
Residential Mortgage Jr. | Adjustments | ASU 2016-13    
Allowance for credit losses    
Balance at beginning of period   11
Balance at end of period   226
HELOC    
Allowance for credit losses    
Balance at beginning of period   4,327
Charge-offs   (1,053)
Recoveries   1,251
Net charge-offs   198
Provision (benefit)   (1,311)
Balance at end of period   16,698
Quantitative allowance    
Collectively evaluated   14,625
Individually evaluated   77
Total quantitative allowance   14,702
Qualitative allowance   1,996
Provision for loan losses charged to operations   (1,311)
HELOC | Initial PCD Allowance    
Allowance for credit losses    
Balance at beginning of period   289
Balance at end of period   5,119
HELOC | Adjustments    
Allowance for credit losses    
Balance at beginning of period   8,465
Balance at end of period    
HELOC | Adjustments | ASU 2016-13    
Allowance for credit losses    
Balance at beginning of period   3,849
Balance at end of period   4,227
Residential Construction    
Allowance for credit losses    
Balance at beginning of period   815
Charge-offs   (32)
Recoveries   111
Net charge-offs   79
Provision (benefit)   (2,954)
Balance at end of period   4,914
Quantitative allowance    
Collectively evaluated   4,733
Total quantitative allowance   4,733
Qualitative allowance   181
Provision for loan losses charged to operations   (2,954)
Residential Construction | Initial PCD Allowance    
Allowance for credit losses    
Balance at end of period   1,302
Residential Construction | Adjustments    
Allowance for credit losses    
Balance at beginning of period   1,594
Balance at end of period    
Residential Construction | Adjustments | ASU 2016-13    
Allowance for credit losses    
Balance at beginning of period   779
Balance at end of period   4,893
Other C&D    
Allowance for credit losses    
Balance at beginning of period   6,211
Charge-offs   (347)
Recoveries   1,407
Net charge-offs   1,060
Provision (benefit)   40,279
Balance at end of period   67,197
Quantitative allowance    
Collectively evaluated   67,188
Individually evaluated   9
Total quantitative allowance   67,197
Provision for loan losses charged to operations   40,279
Other C&D | Initial PCD Allowance    
Allowance for credit losses    
Balance at beginning of period   351
Balance at end of period   6,035
Other C&D | Adjustments    
Allowance for credit losses    
Balance at beginning of period   12,150
Balance at end of period    
Other C&D | Adjustments | ASU 2016-13    
Allowance for credit losses    
Balance at beginning of period   5,588
Balance at end of period   7,673
Consumer    
Allowance for credit losses    
Balance at beginning of period   4,350
Charge-offs   (6,158)
Recoveries   1,922
Net charge-offs   (4,236)
Provision (benefit)   12,333
Balance at end of period   26,562
Quantitative allowance    
Collectively evaluated   18,435
Individually evaluated   120
Total quantitative allowance   18,555
Qualitative allowance   8,007
Provision for loan losses charged to operations   12,333
Consumer | Initial PCD Allowance    
Allowance for credit losses    
Balance at beginning of period   669
Balance at end of period   6,120
Consumer | Adjustments    
Allowance for credit losses    
Balance at beginning of period   8,509
Balance at end of period    
Consumer | Adjustments | ASU 2016-13    
Allowance for credit losses    
Balance at beginning of period   3,490
Balance at end of period   3,836
Multifamily    
Allowance for credit losses    
Balance at beginning of period   1,557
Recoveries   71
Net charge-offs   71
Provision (benefit)   2,657
Balance at end of period   7,887
Quantitative allowance    
Collectively evaluated   7,887
Total quantitative allowance   7,887
Provision for loan losses charged to operations   2,657
Multifamily | Initial PCD Allowance    
Allowance for credit losses    
Balance at beginning of period   97
Balance at end of period   902
Multifamily | Adjustments    
Allowance for credit losses    
Balance at beginning of period   3,045
Balance at end of period    
Multifamily | Adjustments | ASU 2016-13    
Allowance for credit losses    
Balance at beginning of period   1,391
Balance at end of period   1,212
Municipal    
Allowance for credit losses    
Balance at beginning of period   956
Provision (benefit)   (2,282)
Balance at end of period   1,510
Quantitative allowance    
Collectively evaluated   685
Total quantitative allowance   685
Qualitative allowance   825
Provision for loan losses charged to operations   (2,282)
Municipal | Initial PCD Allowance    
Allowance for credit losses    
Balance at end of period   1,003
Municipal | Adjustments    
Allowance for credit losses    
Balance at beginning of period   1,870
Balance at end of period    
Municipal | Adjustments | ASU 2016-13    
Allowance for credit losses    
Balance at beginning of period   914
Balance at end of period   919
CRE Owner Occupied    
Allowance for credit losses    
Balance at beginning of period   10,879
Charge-offs   (1,205)
Recoveries   1,089
Net charge-offs   (116)
Provision (benefit)   16,468
Balance at end of period   97,104
Quantitative allowance    
Collectively evaluated   91,106
Individually evaluated   948
Total quantitative allowance   92,054
Qualitative allowance   5,050
Provision for loan losses charged to operations   16,468
CRE Owner Occupied | Initial PCD Allowance    
Allowance for credit losses    
Balance at beginning of period   898
Balance at end of period   34,077
CRE Owner Occupied | Adjustments    
Allowance for credit losses    
Balance at beginning of period   21,282
Balance at end of period    
CRE Owner Occupied | Adjustments | ASU 2016-13    
Allowance for credit losses    
Balance at beginning of period   9,505
Balance at end of period   25,393
Non Owner Occupied CRE    
Allowance for credit losses    
Balance at beginning of period   15,219
Charge-offs   (601)
Recoveries   518
Net charge-offs   (83)
Provision (benefit)   13,877
Balance at end of period   124,421
Quantitative allowance    
Collectively evaluated   116,571
Individually evaluated   6
Total quantitative allowance   116,577
Qualitative allowance   7,844
Provision for loan losses charged to operations   13,877
Non Owner Occupied CRE | Initial PCD Allowance    
Allowance for credit losses    
Balance at beginning of period   656
Balance at end of period   45,787
Non Owner Occupied CRE | Adjustments    
Allowance for credit losses    
Balance at beginning of period   29,773
Balance at end of period    
Non Owner Occupied CRE | Adjustments | ASU 2016-13    
Allowance for credit losses    
Balance at beginning of period   13,898
Balance at end of period   35,067
C & I    
Allowance for credit losses    
Balance at beginning of period   6,470
Charge-offs   (4,654)
Recoveries   3,810
Net charge-offs   (844)
Provision (benefit)   6,798
Balance at end of period   46,217
Quantitative allowance    
Collectively evaluated   38,805
Individually evaluated   7
Total quantitative allowance   38,812
Qualitative allowance   7,405
Provision for loan losses charged to operations   6,798
C & I | Initial PCD Allowance    
Allowance for credit losses    
Balance at beginning of period   39
Balance at end of period   18,320
C & I | Adjustments    
Allowance for credit losses    
Balance at beginning of period   12,659
Balance at end of period    
C & I | Adjustments | ASU 2016-13    
Allowance for credit losses    
Balance at beginning of period   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    
Provision (benefit)   9,600
Quantitative allowance    
Provision for loan losses charged to operations   $ 9,600