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Summary of Significant Accounting Policies (Details)	3 Months Ended												12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares	Sep. 30, 2018 $ / shares	Jun. 30, 2018 $ / shares	Mar. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Sep. 30, 2017 $ / shares	Jun. 30, 2017 $ / shares	Mar. 31, 2017 $ / shares	Dec. 31, 2016 USD ($) $ / shares shares	Sep. 30, 2016 $ / shares	Jun. 30, 2016 $ / shares	Mar. 31, 2016 $ / shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 shares	Dec. 31, 2018 USD ($) market shares	Dec. 31, 2017 USD ($) shares
Schedule of Equity Method Investments [Line Items]
Revaluation of deferred tax assets and liabilities													$ 0	$ 31,486,000	$ 0
Number of Markets in Which Entity Operates | market																	11
Goodwill [Roll Forward]
Balance at December 31, 2017				$ 1,808,002,000									1,808,002,000
Goodwill, Acquired During Period													0
Goodwill, Purchase Accounting Adjustments													(881,000)
Balance at December 31, 2018	$ 1,807,121,000				$ 1,808,002,000								1,807,121,000	1,808,002,000
Finite-lived Intangible Assets [Roll Forward]
Balance at December 31, 2017				56,710,000									56,710,000
Acquisitions													0
Amortization													(10,549,000)	(8,816,000)	(4,281,000)
Change in purchase price allocation of previous acquisitions													0
Balance at December 31, 2018	46,161,000				56,710,000								46,161,000	56,710,000
Balance at December 31, 2016				1,864,712,000									1,864,712,000
Acquisitions													0
Amortization													(10,549,000)
Balance at December 31, 2017	1,853,282,000				1,864,712,000								1,853,282,000	1,864,712,000
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross																	$ 92,787,000	$ 92,787,000
Accumulated amortization																	(46,626,000)	(36,077,000)
Net book value	$ 46,161,000			$ 56,710,000	$ 56,710,000								$ 56,710,000	56,710,000			$ 46,161,000	56,710,000
Cash Equivalents and Cash Flows [Abstract]
Cash equivalents maturity period													90 days
Cash Payments [Abstract]
Interest													$ 199,464,000	91,628,000	37,003,000
Income taxes paid													55,626,000	81,539,000	49,504,000
Noncash Transactions [Abstract]
Loans charged-off to the allowance for loan losses													(30,400,000)	(22,046,000)	(31,112,000)
Real Estate Owned, Transfer to Real Estate Owned													3,524,000	6,228,000	4,453,000
Loans foreclosed upon with repossessions transferred to other repossessed assets													1,899,000	646,000	1,842,000
Other Real Estate Sales Financed													891,000	908,000	0
Available-for-sale securities transferred to Held-to-Maturity													179,763,000	0	0
Transfer of Loans Held-for-sale to Portfolio Loans													44,980,000	0	0
Common stock issued in connection with acquisitions													$ 0	1,850,968,000	222,162,000
Loans [Abstract]
Number of loan segments													5
Net deferred loan fees													$ 7,400,000	7,800,000
Percentage of loan portfolio assigned specific risk rating																	80.80%
Premises and Equipment and Leaseholds [Abstract]
Deferred liability associated with escalating rentals																	$ 3,800,000
Other Assets [Abstract]
Premises and equipment, net																	265,560,000	266,014,000
Amortization													3,000,000	2,500,000	2,300,000
Cash surrender value of life insurance																	525,700,000	415,900,000
Noninterest income related to cash surrender value of bank owned life insurance policies													12,500,000	7,900,000	3,500,000
investments are included in CRA investments																	32,800,000	22,000,000
Investments as per community reinvestment act																	72,600,000	53,800,000
Variable Interest Entity [Line Items]
Federal Reserve Bank and Federal Home Loan Bank (FHLB) stock																	70,200,000	46,400,000
Alternative Investment																	$ 26,400,000	16,700,000
Gain (loss) due to change in fair value of investments													2,734,000	364,000
Number of trusts investment																	12
Value of investments with trust companies																	$ 239,237,000	221,667,000
Other Real Estate Owned [Abstract]
Other real estate owned																	16,200,000	29,100,000
Valuation allowance related to other real estate owned																	1,006,000	1,200,000
Foreclosed real estate expense													$ 723,000	$ 1,079,000	396,000
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued									$ 0						$ 0		$ 0	$ 0
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options outstanding (in shares) | shares									550,490						550,490	1,251,601	176,709	274,586
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | shares													338,545	567,611	694,909
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares													0
Basic earnings per share calculation [Abstract]
Numerator - Net income (loss) available to common stockholders													$ 359,440,000	$ 173,979,000	$ 127,225,000
Denominator - Weighted average common shares outstanding (in shares) | shares													77,111,372	63,760,578	43,037,083
Basic net income per common share (in dollars per share) | $ / shares	$ 1.24	$ 1.22	$ 1.13	$ 1.08	$ 0.35	$ 0.84	$ 0.81	$ 0.83	$ 0.79	$ 0.71	$ 0.75	$ 0.70	$ 4.66	$ 2.73	$ 2.96
Diluted net income per share calculation [Abstract]
Numerator - Net income (loss) available to common stockholders													$ 359,440,000	$ 173,979,000	$ 127,225,000
Denominator - Weighted average common shares outstanding (in shares) | shares													77,111,372	63,760,578	43,037,083
Dilutive shares (in shares) | shares													338,545	567,611	694,909
Weighted average diluted common shares outstanding (in shares) | shares													77,449,917	64,328,189	43,731,992
Diluted net income per common share (in dollars per share) | $ / shares	$ 1.23	$ 1.21	$ 1.12	$ 1.08	$ 0.35	$ 0.83	$ 0.80	$ 0.82	$ 0.78	$ 0.71	$ 0.73	$ 0.68	$ 4.64	$ 2.70	$ 2.91
New Accounting Pronouncements or Change in Accounting Principle
Estimated right of use asset and additional lease liability													$ 80,000,000
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Value of investments with trust companies																	$ 3,995,000
Small Impaired Loans
Financing Receivable, Impaired [Line Items]
Principal balance of loans subject to individual determination of impairment																	750,000
Premises and Equipment | Minimum
Premises and Equipment and Leaseholds [Abstract]
Premises and equipment, useful life													3 years
Premises and Equipment | Maximum
Premises and Equipment and Leaseholds [Abstract]
Premises and equipment, useful life													30 years
Computer Software, Intangible Asset
Other Assets [Abstract]
Premises and equipment, net																	$ 7,700,000	$ 9,300,000
Computer Software, Intangible Asset | Minimum
Premises and Equipment and Leaseholds [Abstract]
Premises and equipment, useful life													3 years
Computer Software, Intangible Asset | Maximum
Premises and Equipment and Leaseholds [Abstract]
Premises and equipment, useful life													7 years
Bankers Healthcare Group, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage																	49.00%
Finite-lived Intangible Assets [Roll Forward]
Amortization													$ (2,800,000)	$ (3,300,000)
Internal Revenue Service (IRS) | Minimum
Income Tax Contingency [Line Items]
Tax year open to audit under the statute of limitation																2015
Internal Revenue Service (IRS) | Maximum
Income Tax Contingency [Line Items]
Tax year open to audit under the statute of limitation													2018
Employee Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options outstanding (in shares) | shares																	176,709

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