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Income Taxes - Provision for income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Difference between the provision for income taxes and taxes computed by applying the federal statutory income tax rate to income before provision for income taxes      
Income taxes at federal statutory rate $ 48,389 $ 47,094 $ 59,082
Increase (reduction) of taxes resulting from:      
State income taxes, net of federal tax benefit 4,080 5,916 2,032
Non- deductible merger expenses     586
Increase in cash surrender value of BOLI policies (1,210) (1,261) (1,319)
Tax-exempt interest (1,877) (2,037) (2,840)
Income tax credits (6,881) (3,118) (1,951)
Dividends received deduction (2) (5) (12)
Non-deductible FDIC premiums 133 191  
Revaluation of net deferred tax asset due to tax law change   (991) 26,558
Other, net 1,310 (405) (885)
Provision for income taxes 43,942 45,384 $ 81,251
Components of the net deferred tax asset      
Allowance for loan losses 14,468 12,953  
Other-than-temporary impairment on securities 250 257  
Share-based compensation 4,975 4,475  
Pension plan and post-retirement benefits 494 192  
Deferred compensation 12,475 11,841  
Purchase accounting adjustments 24,530 28,659  
Other real estate owned 380 455  
Net operating loss and tax credit carryforwards 10,347 11,572  
Lease liability 19,146    
Cash flow hedge 3,034 11  
Unrealized losses on investment securities available for sale   7,273  
Other 1,040 1,665  
Total deferred tax assets 91,139 79,353  
Unrealized gains on investment securities available for sale 2,373    
Depreciation 6,585 7,314  
Intangible assets 9,979 12,617  
Net deferred loan costs 9,082 9,409  
Right of use assets 19,465    
Prepaid expense 474 474  
Tax deductible goodwill 810 388  
Mortgage servicing rights 6,688 7,608  
Other 480 840  
Total deferred tax liabilities 55,936 38,650  
Net deferred tax assets before valuation allowance 35,203 40,703  
Less, valuation allowance (3,887) (3,575)  
Net deferred tax assets $ 31,316 $ 37,128