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Summary of Significant Accounting Policies (Details) |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 USD ($) | Jul. 02, 2019 USD ($) | Jan. 01, 2019 USD ($) | Mar. 01, 2016 USD ($) | Dec. 31, 2020 USD ($) $ / shares | Sep. 30, 2020 USD ($) $ / shares | Jun. 30, 2020 USD ($) $ / shares | Mar. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Sep. 30, 2019 USD ($) $ / shares | Jun. 30, 2019 USD ($) $ / shares | Mar. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) $ / shares | Jun. 30, 2018 USD ($) $ / shares | Mar. 31, 2018 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 shares | Dec. 31, 2020 USD ($) market shares | Dec. 31, 2019 USD ($) shares
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Markets in Which Entity Operates | market |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2019 | $ 1,819,811,000 |  |  |  |  |  |  | $ 1,819,811,000 |  |  |  |  |  |  |  |  | $ 1,819,811,000 |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Balance at December 31, 2020 |  |  |  |  | $ 1,819,811,000 |  |  |  | $ 1,819,811,000 |  |  |  |  |  |  |  | 1,819,811,000 | $ 1,819,811,000 |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2019 | 51,130,000 |  |  |  |  |  |  | 51,130,000 |  |  |  |  |  |  |  |  | 51,130,000 |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,793,000) | (9,908,000) |  | $ (10,549,000) |  |  |
Balance at December 31, 2020 |  |  |  |  | 42,336,000 |  |  |  | 51,130,000 |  |  |  |  |  |  |  | 42,336,000 | 51,130,000 |  |  |  |  |
Balance at December 31, 2019 | 1,870,941,000 |  |  |  |  |  |  | 1,870,941,000 |  |  |  |  |  |  |  |  | 1,870,941,000 |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,793,000) |  |  |  |  |  |
Balance at December 31, 2020 |  |  |  |  | 1,862,147,000 |  |  |  | 1,870,941,000 |  |  |  |  |  |  |  | 1,862,147,000 | 1,870,941,000 |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 108,665,000 | $ 107,665,000
Accumulated amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (66,329,000) | (56,535,000)
Net book value | 51,130,000 |  |  |  | 42,336,000 |  |  | 51,130,000 | 51,130,000 |  |  |  |  |  |  |  | $ 42,336,000 | 51,130,000 |  |  |  | 42,336,000 | 51,130,000
Cash Equivalents and Cash Flows [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents maturity period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 days |  |  |  |  |  |
Cash Payments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 215,888,000 | 287,272,000 |  | 199,464,000 |  |  |
Income taxes paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 110,798,000 | 86,960,000 |  | 55,626,000 |  |  |
Noncash Transactions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans charged-off to the allowance for credit losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (49,333,000) | (28,467,000) |  | (30,400,000) |  |  |
Real Estate Owned, Transfer to Real Estate Owned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,436,000 | 17,937,000 |  | 3,524,000 |  |  |
Loans foreclosed upon with repossessions transferred to other repossessed assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000 | 93,000 |  | 1,899,000 |  |  |
Other Real Estate Sales Financed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 871,000 |  | 891,000 |  |  |
Fixed assets transferred to other real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 8,182,000 |  | 0 |  |  |
Available-for-sale securities transferred to Held-to-Maturity |  |  |  |  |  |  |  | 873,600,000 |  |  |  |  |  | $ 179,800,000 |  |  | 873,613,000 | 0 |  | 179,763,000 |  |  |
Held-for-sale loans transferred to held-for-investment loan portfolios |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 44,980,000 |  |  |
Right of Use Assets Recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,820,000 | 90,927,000 | [1] | 0 |  |  |
Loans [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and Leases Receivable, Deferred Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 53,200,000 | 13,700,000
Percentage of loan portfolio assigned specific risk rating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 81.40% |
Other Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premises and equipment, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 290,001,000 | 273,932,000
Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,300,000 | 2,700,000 |  | 3,000,000.0 |  |  |
Cash surrender value of life insurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 743,900,000 | 652,700,000
Bank-owned life insurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,784,000 | 17,361,000 |  | 12,535,000 |  |  |
investments are included in CRA investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 143,200,000 | 100,900,000
Investments as per community reinvestment act |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,200,000 | 58,400,000
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Reserve Bank and Federal Home Loan Bank (FHLB) stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,400,000 | 80,400,000
Other Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 47,800,000 | 38,200,000
Gain (loss) due to change in fair value of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 | 2,800,000 |  | 2,700,000 |  |  |
Number of trusts investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 |
Value of investments with trust companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 308,556,000 | 278,037,000
Other Real Estate Owned [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other real estate owned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,400,000 | 30,300,000
Valuation allowance related to other real estate owned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 772,000
Foreclosed real estate expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,600,000 | $ 4,200,000 |  | $ 723,000 |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (571,000) | $ 0
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 178,591 |  |  |  |  |  |  | 178,591 | 276,468 | 101,769 | 119,274
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 277,896 | 399,600 |  | 338,545 |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 394,593 | 160,492 |  | 253,193 |  |  |
Basic earnings per share calculation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator - Net income (loss) available to common stockholders |  |  |  |  | $ 107,078,000 | $ 106,847,000 | $ 62,444,000 | $ 28,356,000 | $ 96,079,000 | $ 110,521,000 | $ 100,321,000 | $ 93,960,000 | $ 95,318,000 | $ 93,747,000 | $ 86,865,000 | $ 83,510,000 | $ 304,725,000 | $ 400,881,000 |  | $ 359,440,000 |  |  |
Denominator - Weighted average common shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,376,489 | 76,364,303 |  | 77,111,372 |  |  |
Basic net income per common share (in dollars per share) | $ / shares |  |  |  |  | $ 1.42 | $ 1.42 | $ 0.83 | $ 0.37 | $ 1.26 | $ 1.45 | $ 1.31 | $ 1.22 | $ 1.24 | $ 1.22 | $ 1.13 | $ 1.08 | $ 4.04 | $ 5.25 |  | $ 4.66 |  |  |
Diluted net income per share calculation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator - Net income (loss) available to common stockholders |  |  |  |  | $ 107,078,000 | $ 106,847,000 | $ 62,444,000 | $ 28,356,000 | $ 96,079,000 | $ 110,521,000 | $ 100,321,000 | $ 93,960,000 | $ 95,318,000 | $ 93,747,000 | $ 86,865,000 | $ 83,510,000 | $ 304,725,000 | $ 400,881,000 |  | $ 359,440,000 |  |  |
Denominator - Weighted average common shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,376,489 | 76,364,303 |  | 77,111,372 |  |  |
Dilutive shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 277,896 | 399,600 |  | 338,545 |  |  |
Weighted average diluted common shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,654,385 | 76,763,903 |  | 77,449,917 |  |  |
Diluted net income per common share (in dollars per share) | $ / shares |  |  |  |  | $ 1.42 | $ 1.42 | $ 0.83 | $ 0.37 | $ 1.26 | $ 1.44 | $ 1.31 | $ 1.22 | $ 1.23 | $ 1.21 | $ 1.12 | $ 1.08 | $ 4.03 | $ 5.22 |  | $ 4.64 |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right of Use Assets Recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,820,000 | $ 90,927,000 | [1] | $ 0 |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,102,000 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,500,000 | $ 6,000,000.0
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,200,000) | $ (1,900,000) |  | $ (2,800,000) |  |  |
Internal Revenue Service (IRS) | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax year open to audit under the statute of limitation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2017 |  |
Internal Revenue Service (IRS) | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax year open to audit under the statute of limitation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2020 |  |  |  |  |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of investments with trust companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000,000.0 |
Advocate Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid to redeem common stock |  | $ 59,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans, net of allowance for loan losses |  | 45,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  | $ 134,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101,769 |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  |  |  |  | $ 31,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 34,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Off-Balance Sheet, Credit Loss, Liability | 8,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Taxes Recorded due to Cumulative Change in Accounting Principle | 11,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | $ 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Includes $79.9 million recognized upon initial adoption of ASU 2016-02 on January 1, 2019.

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