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ALLOWANCE FOR CREDIT LOSSES AND RESERVE FOR OFF-BALANCE SHEET CREDIT EXPOSURE (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Changes in the allowance    
Beginning balance $ 47,971 $ 47,916
Provision for credit losses 9,329 1,283
Subtotal   49,199
Charge-offs 2,654 2,714
Recoveries 1,433 782
Net charge-offs (recoveries) 1,221 1,932
Ending balance 59,645 47,267
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]    
Off-balance sheet, credit loss, liability, beginning balance 1,272 1,242
Provision for off-balance sheet credit exposures 1,798 167
Off-balance sheet, credit loss, liability, ending balance 3,810 1,409
Commercial, Financial & Agricultural    
Changes in the allowance    
Beginning balance 8,136 8,027
Provision for credit losses 1,231 50
Subtotal   8,077
Charge-offs 437 463
Recoveries 342 233
Net charge-offs (recoveries) 95 230
Ending balance 8,645 7,847
Construction | Real Estate    
Changes in the allowance    
Beginning balance 1,792 1,202
Provision for credit losses 655 91
Subtotal   1,293
Charge-offs 0 0
Recoveries 131 6
Net charge-offs (recoveries) (131) (6)
Ending balance 3,057 1,299
Residential Mortgage | Real Estate    
Changes in the allowance    
Beginning balance 13,327 14,349
Provision for credit losses (935) (1,520)
Subtotal   12,829
Charge-offs 0 0
Recoveries 181 22
Net charge-offs (recoveries) (181) (22)
Ending balance 13,181 12,851
Home Equity | Real Estate    
Changes in the allowance    
Beginning balance 4,206 3,788
Provision for credit losses (314) 481
Subtotal   4,269
Charge-offs 0 0
Recoveries 31 9
Net charge-offs (recoveries) (31) (9)
Ending balance 2,309 4,278
Commercial Mortgage | Real Estate    
Changes in the allowance    
Beginning balance 11,113 13,358
Provision for credit losses 5,779 (1,322)
Subtotal   12,036
Charge-offs 0 0
Recoveries 2 0
Net charge-offs (recoveries) (2) 0
Ending balance 19,518 12,036
Consumer | Consumer    
Changes in the allowance    
Beginning balance 9,397 7,192
Provision for credit losses 2,913 3,503
Subtotal   10,695
Charge-offs 2,217 2,251
Recoveries 746 512
Net charge-offs (recoveries) 1,471 1,739
Ending balance 12,935 $ 8,956
Impact of the adoption of new accounting standards    
Changes in the allowance    
Beginning balance 3,566  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]    
Off-balance sheet, credit loss, liability, beginning balance 740  
Impact of the adoption of new accounting standards | Commercial, Financial & Agricultural    
Changes in the allowance    
Beginning balance (627)  
Impact of the adoption of new accounting standards | Construction | Real Estate    
Changes in the allowance    
Beginning balance 479  
Impact of the adoption of new accounting standards | Residential Mortgage | Real Estate    
Changes in the allowance    
Beginning balance 608  
Impact of the adoption of new accounting standards | Home Equity | Real Estate    
Changes in the allowance    
Beginning balance (1,614)  
Impact of the adoption of new accounting standards | Commercial Mortgage | Real Estate    
Changes in the allowance    
Beginning balance 2,624  
Impact of the adoption of new accounting standards | Consumer | Consumer    
Changes in the allowance    
Beginning balance 2,096  
Adjusted balance at beginning of period    
Changes in the allowance    
Beginning balance 51,537  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]    
Off-balance sheet, credit loss, liability, beginning balance 2,012  
Adjusted balance at beginning of period | Commercial, Financial & Agricultural    
Changes in the allowance    
Beginning balance 7,509  
Adjusted balance at beginning of period | Construction | Real Estate    
Changes in the allowance    
Beginning balance 2,271  
Adjusted balance at beginning of period | Residential Mortgage | Real Estate    
Changes in the allowance    
Beginning balance 13,935  
Adjusted balance at beginning of period | Home Equity | Real Estate    
Changes in the allowance    
Beginning balance 2,592  
Adjusted balance at beginning of period | Commercial Mortgage | Real Estate    
Changes in the allowance    
Beginning balance 13,737  
Adjusted balance at beginning of period | Consumer | Consumer    
Changes in the allowance    
Beginning balance $ 11,493