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Mergers and Acquisitions - Atlantic Capital (Details)
3 Months Ended 6 Months Ended
Mar. 01, 2022
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mergers and Acquisitions              
Goodwill   $ 1,922,525,000   $ 1,922,525,000     $ 1,581,085,000
Deposits:              
Goodwill   1,922,525,000   1,922,525,000     $ 1,581,085,000
Consideration:              
Reversal of CSFL's ending allowance for credit losses   6,163,000 $ 5,662,000 11,653,000 $ 9,036,000    
Atlantic Capital              
Mergers and Acquisitions              
Shares of the common stock in exchange for each share 0.36            
Purchase price $ 657,810,000            
Loans at fair value acquired after initial fair value adjustment 2,400,000,000            
Estimated discount on loans $ 54,300,000            
Estimated discount on loans (as a percent) 2.24%            
Loans acquired as a percentage of total loans 10.00%            
Credit deficiencies that were identified as Purchased Credit Deteriorated ("PCD") loans. $ 137,900,000            
Goodwill 341,440,000         $ 342,900,000  
Acquisition costs   $ 2,200,000   $ 7,900,000      
Assets              
Cash and cash equivalents 250,158,000            
Investment securities 703,710,000            
Loans, net of allowance and mark 2,369,678,000            
Premises and equipment 19,500,000            
Intangible assets 20,791,000            
Bank owned life insurance 74,613,000            
Deferred tax asset 32,060,000            
Other assets 51,554,000            
Total assets 3,522,064,000            
Deposits:              
Noninterest-bearing 1,411,671,000            
Interest-bearing 1,616,970,000            
Total deposits 3,028,641,000            
Federal funds purchased and securities sold under agreements to repurchase 50,000,000            
Other borrowings 78,417,000            
Other liabilities 48,636,000            
Total liabilities 3,205,694,000            
Net identifiable assets acquired over (under) liabilities assumed 316,370,000            
Goodwill 341,440,000         $ 342,900,000  
Net assets acquired over liabilities assumed $ 657,810,000            
Consideration:              
Number of shares issued as consideration | shares 7,330,803            
Purchase price per share of the Company's common stock | $ / shares $ 90.00            
Company common stock issued and cash exchanged for fractional shares. $ 659,791,000            
Value of shares issued 659,772,000            
Value of common stock issued for fractional shares 19,000            
Stock option conversion 1,135,000            
Restricted stock unit conversion 2,870,000            
Restricted stock awards conversion (unvested awards) (5,986,000)            
Fair value of total consideration transferred 657,810,000            
Reversal of fair value adjustments 17,200,000            
Securities and time deposits at fair value (discount) 30,900,000            
HTM reclassified to AFS $ 237,600,000            
Credit mark of the loan portfolio (as a percent) 1.40%            
Credit mark of the loan portfolio $ 34,000,000.0            
Net credit discount of the loan portfolio (as a percent) 2.24%            
Net non-credit discount of the loan portfolio $ 54,300,000            
Reversal of CSFL's ending allowance for credit losses 22,100,000            
Fair value adjustment for reversal of deferred fees and costs 7,600,000            
Fair value adjustment for fixed assets and leased assets 2,600,000            
Core deposit intangible from a third party valuation $ 17,500,000            
Core deposit intangible from a third party valuation (as a percent) 0.63            
Serving assets from third party valuation $ 3,200,000            
Servicing assets written off 19,900,000            
Goodwill written off $ 2,600,000            
Deferred tax assets related to fair value adjustments with effective tax rate 24.60%            
Fair value negative adjustment for investment in low income housing $ 1,100,000            
Fair value adjustment (decrease) on write-off of prepaid assets 233,000            
Fair value adjustment for receivables 154,000            
Fair value adjustment for Small Business Investment Company ("SBIC') Investments 7,400,000            
Issuance costs on subordinated debt 900,000            
Fair value adjustment on reversal of debt issuance costs 3,400,000            
Reversal of an existing unfunded commitment reserve at purchase date 2,800,000            
Fair value adjustment to increase lease liabilities associated with rental facilities 1,400,000            
Fair value adjustment for reversal of uncertain tax liability 700,000            
Atlantic Capital | As Recorded by Atlantic Capital              
Assets              
Cash and cash equivalents 250,134,000            
Investment securities 717,332,000            
Loans, net of allowance and mark 2,394,256,000            
Premises and equipment 16,892,000            
Intangible assets 22,572,000            
Bank owned life insurance 74,613,000            
Deferred tax asset 30,231,000            
Other assets 45,274,000            
Total assets 3,551,304,000            
Deposits:              
Noninterest-bearing 1,411,671,000            
Interest-bearing 1,616,970,000            
Total deposits 3,028,641,000            
Federal funds purchased and securities sold under agreements to repurchase 50,000,000            
Other borrowings 74,131,000            
Other liabilities 50,711,000            
Total liabilities 3,203,483,000            
Net identifiable assets acquired over (under) liabilities assumed 347,821,000            
Net assets acquired over liabilities assumed 347,821,000            
Atlantic Capital | Initial Fair Value Adjustments              
Mergers and Acquisitions              
Goodwill 342,939,000            
Assets              
Cash and cash equivalents 24,000            
Investment securities (13,622,000)            
Loans, net of allowance and mark (18,964,000)            
Premises and equipment 2,608,000            
Intangible assets (1,781,000)            
Deferred tax asset 2,273,000            
Other assets (1,277,000)            
Total assets (30,739,000)            
Deposits:              
Other borrowings 4,286,000            
Other liabilities (2,075,000)            
Total liabilities 2,211,000            
Net identifiable assets acquired over (under) liabilities assumed (32,950,000)            
Goodwill 342,939,000            
Net assets acquired over liabilities assumed 309,989,000            
Atlantic Capital | Subsequent Fair Value Adjustments              
Mergers and Acquisitions              
Goodwill (1,499,000)            
Assets              
Loans, net of allowance and mark (5,614,000)            
Deferred tax asset (444,000)            
Other assets 7,557,000            
Total assets 1,499,000            
Deposits:              
Net identifiable assets acquired over (under) liabilities assumed 1,499,000            
Goodwill $ (1,499,000)