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Allowance for Credit Losses (ACL) - Disaggregated analysis of the changes in allowance for credit losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 07, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Allowance for credit losses          
Balance at beginning of period   $ 406,460 $ 144,785 $ 457,309 $ 56,927
Charge-offs   (5,662) (2,431) (9,036) (5,654)
Recoveries   3,548 2,330 6,943 4,239
Net (charge-offs) recoveries   (2,114) (101) (2,093) (1,415)
(Recovery) provision   (53,945) 29,536 (104,815) 64,270
Balance at end of period   350,401 434,608 350,401 434,608
Quantitative allowance          
Collectively evaluated   323,558 356,187 323,558 356,187
Individually evaluated   1,885 10,904 1,885 10,904
Total quantitative allowance   325,443 367,091 325,443 367,091
Qualitative allowance   24,958 67,517 24,958 67,517
Provision for credit losses   (53,945) 29,536 (104,815) 64,270
Unfunded Commitment          
Allowance for credit losses          
(Recovery) provision   4,800 12,500 12,400 14,300
Quantitative allowance          
Provision for credit losses   4,800 12,500 12,400 14,300
Initial PCD Allowance          
Allowance for credit losses          
Balance at beginning of period     150,946   3,408
Balance at end of period     150,946   150,946
Adjustments          
Allowance for credit losses          
Balance at beginning of period     405,173   111,365
Adjustments | ASU 2016-13          
Allowance for credit losses          
Balance at beginning of period     109,442   51,030
Balance at end of period     109,442   109,442
Residential Mortgage Sr.          
Allowance for credit losses          
Balance at beginning of period   63,042 18,214 63,561 6,128
Charge-offs   (69) (79) (189) (383)
Recoveries   343 315 771 591
Net (charge-offs) recoveries   274 236 582 208
(Recovery) provision   (7,496) 2,418 (8,323) 8,671
Balance at end of period   55,820 67,486 55,820 67,486
Quantitative allowance          
Collectively evaluated   50,424 59,101 50,424 59,101
Individually evaluated   88 210 88 210
Total quantitative allowance   50,512 59,311 50,512 59,311
Qualitative allowance   5,308 8,175 5,308 8,175
Provision for credit losses   (7,496) 2,418 (8,323) 8,671
Residential Mortgage Sr. | Initial PCD Allowance          
Allowance for credit losses          
Balance at beginning of period     29,906   406
Balance at end of period     29,906   29,906
Residential Mortgage Sr. | Adjustments          
Allowance for credit losses          
Balance at beginning of period     64,832   11,989
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   16,712
Residential Mortgage Jr.          
Allowance for credit losses          
Balance at beginning of period   1,190 239 1,238 15
Charge-offs     (24)   (24)
Recoveries   50 55 83 146
Net (charge-offs) recoveries   50 31 83 122
(Recovery) provision   (415) (219) (496) (100)
Balance at end of period   825 1,081 825 1,081
Quantitative allowance          
Collectively evaluated   825 1,143 825 1,143
Total quantitative allowance   825 1,143 825 1,143
Qualitative allowance     (62)   (62)
Provision for credit losses   (415) (219) (496) (100)
Residential Mortgage Jr. | Initial PCD Allowance          
Allowance for credit losses          
Balance at beginning of period     804   3
Balance at end of period     804   804
Residential Mortgage Jr. | Adjustments          
Allowance for credit losses          
Balance at beginning of period     1,269   29
Residential Mortgage Jr. | Adjustments | ASU 2016-13          
Allowance for credit losses          
Balance at beginning of period     226   11
Balance at end of period     226   226
HELOC          
Allowance for credit losses          
Balance at beginning of period   16,003 12,092 16,698 4,327
Charge-offs   (517) (67) (686) (681)
Recoveries   766 211 1,183 623
Net (charge-offs) recoveries   249 144 497 (58)
(Recovery) provision   (1,702) 5,040 (2,645) 8,869
Balance at end of period   14,550 26,622 14,550 26,622
Quantitative allowance          
Collectively evaluated   12,350 23,579 12,350 23,579
Individually evaluated   1,140 299 1,140 299
Total quantitative allowance   13,490 23,878 13,490 23,878
Qualitative allowance   1,060 2,744 1,060 2,744
Provision for credit losses   (1,702) 5,040 (2,645) 8,869
HELOC | Initial PCD Allowance          
Allowance for credit losses          
Balance at beginning of period     5,119   289
Balance at end of period     5,119   5,119
HELOC | Adjustments          
Allowance for credit losses          
Balance at beginning of period     21,438   8,465
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   4,227
Residential Construction          
Allowance for credit losses          
Balance at beginning of period   3,892 2,135 4,914 815
Charge-offs     (31)   (31)
Recoveries       1  
Net (charge-offs) recoveries     (31) 1 (31)
(Recovery) provision   596 996 (427) 1,537
Balance at end of period   4,488 9,295 4,488 9,295
Quantitative allowance          
Collectively evaluated   4,438 8,922 4,438 8,922
Total quantitative allowance   4,438 8,922 4,438 8,922
Qualitative allowance   50 373 50 373
Provision for credit losses   596 996 (427) 1,537
Residential Construction | Initial PCD Allowance          
Allowance for credit losses          
Balance at beginning of period     1,302    
Balance at end of period     1,302   1,302
Residential Construction | Adjustments          
Allowance for credit losses          
Balance at beginning of period     8,330   1,594
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   4,893
Other C&D          
Allowance for credit losses          
Balance at beginning of period   55,337 16,777 67,197 6,211
Charge-offs   (77) (69) (87) (174)
Recoveries   229 569 430 849
Net (charge-offs) recoveries   152 500 343 675
(Recovery) provision   (10,001) 2,927 (22,052) 7,379
Balance at end of period   45,488 33,912 45,488 33,912
Quantitative allowance          
Collectively evaluated   45,472 30,750 45,472 30,750
Individually evaluated   16 76 16 76
Total quantitative allowance   45,488 30,826 45,488 30,826
Qualitative allowance     3,086   3,086
Provision for credit losses   (10,001) 2,927 (22,052) 7,379
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   6,035
Other C&D | Adjustments          
Allowance for credit losses          
Balance at beginning of period     30,485   12,150
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   7,673
Consumer          
Allowance for credit losses          
Balance at beginning of period   27,883 8,999 26,562 4,350
Charge-offs   (1,486) (1,122) (3,635) (2,908)
Recoveries   531 428 1,041 896
Net (charge-offs) recoveries   (955) (694) (2,594) (2,012)
(Recovery) provision   (1,231) 1,909 1,729 3,717
Balance at end of period   25,697 20,170 25,697 20,170
Quantitative allowance          
Collectively evaluated   21,195 15,828 21,195 15,828
Total quantitative allowance   21,195 15,828 21,195 15,828
Qualitative allowance   4,502 4,342 4,502 4,342
Provision for credit losses   (1,231) 1,909 1,729 3,717
Consumer | Initial PCD Allowance          
Allowance for credit losses          
Balance at beginning of period     6,120   669
Balance at end of period     6,120   6,120
Consumer | Adjustments          
Allowance for credit losses          
Balance at beginning of period     18,955   8,509
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   3,836
Multifamily          
Allowance for credit losses          
Balance at beginning of period   5,884 4,557 7,887 1,557
Recoveries   3 3 3 55
Net (charge-offs) recoveries   3 3 3 55
(Recovery) provision   (4) 1,118 (2,007) 2,578
Balance at end of period   5,883 7,792 5,883 7,792
Quantitative allowance          
Collectively evaluated   5,883 4,556 5,883 4,556
Total quantitative allowance   5,883 4,556 5,883 4,556
Qualitative allowance     3,236   3,236
Provision for credit losses   (4) 1,118 (2,007) 2,578
Multifamily | Initial PCD Allowance          
Allowance for credit losses          
Balance at beginning of period     902   97
Balance at end of period     902   902
Multifamily | Adjustments          
Allowance for credit losses          
Balance at beginning of period     6,671   3,045
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   1,212
Municipal          
Allowance for credit losses          
Balance at beginning of period   1,544 1,889 1,510 956
(Recovery) provision   (481) 264 (447) 283
Balance at end of period   1,063 4,075 1,063 4,075
Quantitative allowance          
Collectively evaluated   520 2,641 520 2,641
Total quantitative allowance   520 2,641 520 2,641
Qualitative allowance   543 1,434 543 1,434
Provision for credit losses   (481) 264 (447) 283
Municipal | Initial PCD Allowance          
Allowance for credit losses          
Balance at beginning of period     1,003    
Balance at end of period     1,003   1,003
Municipal | Adjustments          
Allowance for credit losses          
Balance at beginning of period     3,811   1,870
Municipal | Adjustments | ASU 2016-13          
Allowance for credit losses          
Balance at beginning of period     919   914
Balance at end of period     919   919
CRE Owner Occupied          
Allowance for credit losses          
Balance at beginning of period   90,660 23,792 97,104 10,879
Charge-offs   (2,021) (308) (2,048) (623)
Recoveries   131 340 464 428
Net (charge-offs) recoveries   (1,890) 32 (1,584) (195)
(Recovery) provision   (13,278) 5,657 (20,028) 8,394
Balance at end of period   75,492 90,206 75,492 90,206
Quantitative allowance          
Collectively evaluated   72,212 78,715 72,212 78,715
Individually evaluated   333 5,319 333 5,319
Total quantitative allowance   72,545 84,034 72,545 84,034
Qualitative allowance   2,947 6,172 2,947 6,172
Provision for credit losses   (13,278) 5,657 (20,028) 8,394
CRE Owner Occupied | Initial PCD Allowance          
Allowance for credit losses          
Balance at beginning of period     35,332   898
Balance at end of period     35,332   35,332
CRE Owner Occupied | Adjustments          
Allowance for credit losses          
Balance at beginning of period     84,517   21,282
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   25,393
Non Owner Occupied CRE          
Allowance for credit losses          
Balance at beginning of period   107,559 41,302 124,421 15,219
Charge-offs   (341) (23) (535) (23)
Recoveries   411 32 732 76
Net (charge-offs) recoveries   70 9 197 53
(Recovery) provision   (17,225) 8,711 (34,214) 20,196
Balance at end of period   90,404 130,874 90,404 130,874
Quantitative allowance          
Collectively evaluated   85,044 101,998 85,044 101,998
Individually evaluated     3,890   3,890
Total quantitative allowance   85,044 105,888 85,044 105,888
Qualitative allowance   5,360 24,986 5,360 24,986
Provision for credit losses   (17,225) 8,711 (34,214) 20,196
Non Owner Occupied CRE | Initial PCD Allowance          
Allowance for credit losses          
Balance at beginning of period     45,785   656
Balance at end of period     45,785   45,785
Non Owner Occupied CRE | Adjustments          
Allowance for credit losses          
Balance at beginning of period     122,154   29,773
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   35,067
C & I          
Allowance for credit losses          
Balance at beginning of period   33,466 14,789 46,217 6,470
Charge-offs   (1,151) (708) (1,856) (807)
Recoveries   1,084 377 2,235 575
Net (charge-offs) recoveries   (67) (331) 379 (232)
(Recovery) provision   (2,708) 715 (15,905) 2,746
Balance at end of period   30,691 43,095 30,691 43,095
Quantitative allowance          
Collectively evaluated   25,195 28,954 25,195 28,954
Individually evaluated   308 1,110 308 1,110
Total quantitative allowance   25,503 30,064 25,503 30,064
Qualitative allowance   5,188 13,031 5,188 13,031
Provision for credit losses   $ (2,708) 715 $ (15,905) 2,746
C & I | Initial PCD Allowance          
Allowance for credit losses          
Balance at beginning of period     18,638   39
Balance at end of period     18,638   18,638
C & I | Adjustments          
Allowance for credit losses          
Balance at beginning of period     42,711   12,659
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   9,284
CSFL          
Allowance for credit losses          
Charge-offs $ (158,200)        
CSFL | Unfunded Commitment          
Allowance for credit losses          
(Recovery) provision     9,600   9,600
Quantitative allowance          
Provision for credit losses     $ 9,600   $ 9,600