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Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 0 $ 0 $ 0
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Federal 73,921,000 63,496,000 49,769,000
Current State and Local Tax Expense (Benefit) 4,822,000 860,000 0
Total current tax expense (benefit) 78,743,000 64,356,000 49,769,000
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Federal 10,162,000 26,339,000 12,776,000
State 1,603,000 1,826,000 1,614,000
Total deferred tax expense (benefit) 11,765,000 59,651,000 14,390,000
Income tax expense (benefit) $ 90,508,000 $ 124,007,000 $ 64,159,000
Federal income tax statutory rate 21.00% 35.00% 35.00%
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income tax expense (benefit) at statutory rate $ 94,489,000 $ 104,295,000 $ 66,984,000
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 5,076,000 1,746,000 1,049,000
Tax-exempt securities 7,222,000 5,666,000 2,510,000
Federal tax credits (845,000) (434,000) (282,000)
Bank owned life insurance (2,764,000) (2,778,000) (1,242,000)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Amount (112,000) (283,000) (159,000)
Deferred tax revaluation expense 0 31,486,000 0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount (2,966,000) (5,365,000) 0
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount 0 0 0
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount 4,852,000 1,006,000 319,000
Income tax expense (benefit) 90,508,000 124,007,000 64,159,000
Deferred Tax Assets, Net [Abstract]      
Loan loss allowance 20,449,000 16,240,000  
Loans 29,453,000 46,567,000  
Insurance 1,955,000 614,000  
Accrued liability for supplemental retirement agreements 6,231,000 7,413,000  
Restricted stock and stock options 9,026,000 8,232,000  
Investments 15,974,000 0  
Cash flow hedge 459,000 499,000  
Equity Method Investments 602,000 635,000  
Leases 1,460,000 1,738,000  
Other real estate owned 1,158,000 2,809,000  
Net operating loss carryforward 13,754,000 18,085,000  
Accrued Bonuses 9,996,000 2,922,000  
Other deferred tax assets 2,503,000 2,451,000  
Total deferred tax assets 113,020,000 108,205,000  
Deferred Tax Liabilities, Net [Abstract]      
Depreciation and amortization 11,769,000 11,504,000  
Core deposit intangible asset 11,408,000 14,073,000  
Securities 0 616,000  
REIT dividends 1,589,000 3,073,000  
FHLB related liabilities 925,000 922,000  
Subordinated debt 1,134,000 1,077,000  
Other deferred tax liabilities 1,444,000 1,171,000  
Total deferred tax liabilities 28,269,000 32,436,000  
Net deferred tax assets 84,751,000 75,769,000  
Unrecognized tax benefits, beginning of period 2,838,000 1,274,000 134,000
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions 2,245,000 1,564,000 1,140,000
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 0 0 0
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations 0 0 0
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities 0 0 0
Unrecognized tax benefits, end of period $ 5,083,000 $ 2,838,000 $ 1,274,000