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Summary of Significant Accounting Policies (Details) | 3 Months Ended | 12 Months Ended |  |
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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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