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v3.19.3.a.u2

Summary of Significant Accounting Policies (Details) |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 02, 2019 USD ($) | Jan. 01, 2019 USD ($) | Mar. 01, 2016 USD ($) | Dec. 31, 2019 USD ($) $ / shares | Sep. 30, 2019 $ / shares | Jun. 30, 2019 $ / shares | Mar. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares | Sep. 30, 2018 $ / shares | Jun. 30, 2018 $ / shares | Mar. 31, 2018 $ / shares | Dec. 31, 2017 $ / shares shares | Sep. 30, 2017 $ / shares | Jun. 30, 2017 $ / shares | Mar. 31, 2017 $ / shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 shares | Dec. 31, 2019 USD ($) market shares | Dec. 31, 2018 USD ($) shares
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Markets in Which Entity Operates | market |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2018 |  | $ 1,807,121,000 |  |  |  |  | $ 1,807,121,000 |  |  |  |  |  |  |  |  | $ 1,807,121,000 |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,690,000 |  |  |  |  |  |
Balance at December 31, 2019 |  |  |  | $ 1,819,811,000 |  |  |  | $ 1,807,121,000 |  |  |  |  |  |  |  | 1,819,811,000 |  | $ 1,807,121,000 |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2017 |  | 46,161,000 |  |  |  |  | 46,161,000 |  |  |  |  |  |  |  |  | 46,161,000 |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,877,000 |  |  |  |  |  |
Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,908,000) |  | (10,549,000) | $ (8,816,000) |  |  |
Balance at December 31, 2018 |  |  |  | 51,130,000 |  |  |  | 46,161,000 |  |  |  |  |  |  |  | 51,130,000 |  | 46,161,000 |  |  |  |
Balance at December 31, 2018 |  | 1,853,282,000 |  |  |  |  | 1,853,282,000 |  |  |  |  |  |  |  |  | 1,853,282,000 |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,567,000 |  |  |  |  |  |
Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,908,000) |  |  |  |  |  |
Balance at December 31, 2019 |  |  |  | 1,870,941,000 |  |  |  | 1,853,282,000 |  |  |  |  |  |  |  | 1,870,941,000 |  | 1,853,282,000 |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 107,665,000 | $ 92,787,000
Accumulated amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (56,535,000) | (46,626,000)
Net book value |  | 46,161,000 |  | $ 51,130,000 |  |  | $ 46,161,000 | $ 46,161,000 |  |  |  |  |  |  |  | $ 51,130,000 |  | 46,161,000 |  |  | $ 51,130,000 | 46,161,000
Cash Equivalents and Cash Flows [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents maturity period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 days |  |  |  |  |  |
Cash Payments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 287,272,000 |  | 199,464,000 | 91,628,000 |  |  |
Income taxes paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 86,960,000 |  | 55,626,000 | 81,539,000 |  |  |
Noncash Transactions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans charged-off to the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (28,467,000) |  | (30,400,000) | (22,046,000) |  |  |
Real Estate Owned, Transfer to Real Estate Owned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,937,000 |  | 3,524,000 | 6,228,000 |  |  |
Loans foreclosed upon with repossessions transferred to other repossessed assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93,000 |  | 1,899,000 | 646,000 |  |  |
Other Real Estate Sales Financed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 871,000 |  | 891,000 | 908,000 |  |  |
Fixed assets transferred to other real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,182,000 |  | 0 | 0 |  |  |
Available-for-sale securities transferred to Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 179,763,000 | 0 |  |  |
Held-for-sale loans transferred to held-for-investment loan portfolios |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 44,980,000 | 0 |  |  |
Common stock issued in connection with acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 1,850,968,000 |  |  |
Right of Use Assets Recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 90,927,000 | [1] | 0 | 0 |  |  |
Loans [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loan segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |
Net deferred loan fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,700,000 |  | 7,400,000 |  |  |  |
Percentage of loan portfolio assigned specific risk rating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.30% |
Other Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premises and equipment, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 273,932,000 | 265,560,000
Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 |  | 3,000,000.0 | 2,500,000 |  |  |
Cash surrender value of life insurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 652,700,000 | 525,700,000
Noninterest income related to cash surrender value of bank owned life insurance policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,400,000 |  | 12,500,000 | 7,900,000 |  |  |
investments are included in CRA investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58,400,000 | 32,800,000
Investments as per community reinvestment act |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,900,000 | 72,600,000
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Reserve Bank and Federal Home Loan Bank (FHLB) stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,400,000 | 70,200,000
Other Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,200,000 | 26,400,000
Gain (loss) due to change in fair value of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 |  | 2,700,000 |  |  |  |
Number of trusts investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 |
Value of investments with trust companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 278,037,000 | 239,237,000
Other Real Estate Owned [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other real estate owned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,300,000 | 16,200,000
Valuation allowance related to other real estate owned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 772,000 | 1,000,000.0
Foreclosed real estate expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,200,000 |  | 723,000 | 1,100,000 |  |  |
Income Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revaluation of deferred tax assets and liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 | $ 31,486,000 |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 276,468 |  |  |  |  |  |  | 276,468 | 552,372 | 119,274 | 178,591
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 399,600 |  | 338,545 | 567,611 |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160,492 |  | 253,193 | 0 |  |  |
Basic earnings per share calculation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator - Net income (loss) available to common stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,881,000 |  | $ 359,440,000 | $ 173,979,000 |  |  |
Denominator - Weighted average common shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 76,364,303 |  | 77,111,372 | 63,760,578 |  |  |
Basic net income per common share (in dollars per share) | $ / shares |  |  |  | $ 1.26 | $ 1.45 | $ 1.31 | $ 1.22 | $ 1.24 | $ 1.22 | $ 1.13 | $ 1.08 | $ 0.35 | $ 0.84 | $ 0.81 | $ 0.83 | $ 5.25 |  | $ 4.66 | $ 2.73 |  |  |
Diluted net income per share calculation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator - Net income (loss) available to common stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,881,000 |  | $ 359,440,000 | $ 173,979,000 |  |  |
Denominator - Weighted average common shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 76,364,303 |  | 77,111,372 | 63,760,578 |  |  |
Dilutive shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 399,600 |  | 338,545 | 567,611 |  |  |
Weighted average diluted common shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 76,763,903 |  | 77,449,917 | 64,328,189 |  |  |
Diluted net income per common share (in dollars per share) | $ / shares |  |  |  | $ 1.26 | $ 1.44 | $ 1.31 | $ 1.22 | $ 1.23 | $ 1.21 | $ 1.12 | $ 1.08 | $ 0.35 | $ 0.83 | $ 0.80 | $ 0.82 | $ 5.22 |  | $ 4.64 | $ 2.70 |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right of Use Assets Recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 90,927,000 | [1] | $ 0 | $ 0 |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,500,000 |  |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of investments with trust companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000,000.0 |
Small Impaired Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance of loans subject to individual determination of impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000.0 |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,000,000.0 | $ 7,700,000
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% |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid to redeem common stock |  |  | $ 74,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,900,000) |  | $ (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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2016 |  |
Internal Revenue Service (IRS) | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax year open to audit under the statute of limitation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2019 |  |  |  |  |  |
Advocate Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid to redeem common stock | $ 59,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | 134,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans, net of allowance for loan losses | $ 45,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 119,274 |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncash Transactions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right of Use Assets Recognized |  | 79,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right of Use Assets Recognized |  | $ 79,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Includes $79.9 million recognized upon initial adoption of ASU 2016-02 on January 1, 2019.

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