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Recent Accounting and Regulatory Pronouncements - Impact of ASU (Details) - USD ($)
$ in Thousands
Jan. 01, 2020
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Assets:              
Investment Securities - Available for Sale   $ 4,369,159   $ 3,330,672      
Investment Securities - Held to Maturity   1,189,265   955,542      
Allowance for Credit Losses on Loans   (350,401) $ (406,460) (457,309) $ (434,608) $ (144,785) $ (56,927)
Deferred Tax Asset   36,714   110,946      
Accrued Interest Receivable - Loans   82,800   93,900      
Liabilities:              
Reserve for Loan Losses - Unfunded Commitments   350,401   457,309      
Equity:              
Retained Earnings   836,584   657,451      
Credit Discount on Acquired Credit Impaired Loans $ 3,408            
Financing Receivable, Allowance for Credit Losses   $ 350,401 $ 406,460 $ 457,309 434,608 144,785 56,927
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent 22.00%            
Non-acquired loans              
Assets:              
Allowance for Credit Losses on Loans $ (34,049)            
Equity:              
Financing Receivable, Allowance for Credit Losses 34,049            
Acquired loans              
Assets:              
Allowance for Credit Losses on Loans (16,981)            
Equity:              
Financing Receivable, Allowance for Credit Losses 16,981            
Purchased Credit Deteriorated Loans              
Assets:              
Allowance for Credit Losses on Loans (3,408)            
Equity:              
Financing Receivable, Allowance for Credit Losses 3,408            
ASU 2016-13              
Assets:              
Acquired Loans [1] 1,723            
Allowance for Credit Losses on Loans [2] (54,438)            
Deferred Tax Asset [3] 12,639            
Accrued Interest Receivable - Loans [1] 1,677            
Liabilities:              
Reserve for Loan Losses - Unfunded Commitments [4] 6,421            
Equity:              
Retained Earnings [5] (44,820)            
Financing Receivable, Allowance for Credit Losses [2] 54,438            
As previously recorded by acquiree | ASU 2016-13              
Assets:              
Investment Securities - Available for Sale 1,956,047            
Non - Acquired Loans 9,252,831            
Acquired Loans 2,118,940            
Allowance for Credit Losses on Loans (111,365)            
Deferred Tax Asset 43,955            
Accrued Interest Receivable - Loans 30,009            
Liabilities:              
Reserve for Loan Losses - Unfunded Commitments 6,756            
Equity:              
Retained Earnings 635,075            
Financing Receivable, Allowance for Credit Losses 111,365            
Adjustments              
Assets:              
Allowance for Credit Losses on Loans           (405,173) (111,365)
Equity:              
Financing Receivable, Allowance for Credit Losses           405,173 111,365
Adjustments | ASU 2016-13              
Assets:              
Investment Securities - Available for Sale 1,956,047            
Non - Acquired Loans 9,252,831            
Acquired Loans 2,117,209            
Allowance for Credit Losses on Loans (56,927)       (109,442) (109,442) (51,030)
Deferred Tax Asset 31,316            
Accrued Interest Receivable - Loans 28,332            
Liabilities:              
Reserve for Loan Losses - Unfunded Commitments 335            
Equity:              
Retained Earnings 679,895            
Financing Receivable, Allowance for Credit Losses $ 56,927       $ 109,442 $ 109,442 $ 51,030
[1] Accrued interest receivable from acquired credit impaired loans of $1,677 was reclassified to other assets and was offset by the reclassification of the grossed up credit discount on acquired credit impaired loans of $3,408 that was moved to the ACL for the purchased credit deteriorated loans.
[2] This is the calculated adjustment to the ACL related to the adoption of ASC 326. Additional reserve related to non-acquired loans was $34,049, to acquired loans was $16,981 and to purchased credit deteriorated loans was $3,408.
[3] This is the effect of deferred tax assets related to the adjustment to the ACL from the adoption of ASC 326 using a 22% tax rate.
[4] This is the adjustment to the reserve for unfunded commitments related to the adoption of ASC 326.
[5] This is the net adjustment to retained earnings related to the adoption of ASC 326.