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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Assets, Fair Value Disclosure [Abstract] |  |  |
Alternative Investment |  | $ 26,400 | $ 16,700
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract] |  |  |
Valuation allowance of impaired loans |  | 4,000 | 2,200
Other Liabilities |  |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |  |
Fair value, beginning of period |  | 0 | 0
Total realized gains included in income |  | 0 | 0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 | 0
Purchases |  | 0 | 0
Issuances |  | 0 | 0
Settlements |  | 0 | 0
Transfers out of Level 3 |  | 0 | 0
Fair value, December 31 |  | 0 | 0
Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
U.S. treasury securities |  | 30,300 | 30,445
U.S. government agency securities |  | 70,159 | 180,801
Mortgage-backed securities |  | 1,310,945 | 1,263,819
State and municipal securities |  | 1,229,654 | 784,612
Asset-Backed Securities, at Carrying Value |  | 375,582 | 173,292
Corporate notes and other |  | 67,046 | 82,314
Total investment securities available-for-sale |  | 3,083,686 | 2,515,283
Alternative Investment |  | 50,791 | 53,796
Other assets |  | 24,524 | 11,812
Total assets at fair value |  | 3,159,001 | 2,580,891
Liabilities at fair value [Abstract] |  |  |
Other liabilities |  | 46,550 | 13,886
Total liabilities at fair value |  | 46,550 | 13,886
Fair Value, Measurements, Recurring | Quoted Market Prices in an Active Market (Level 1) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
U.S. treasury securities |  | 0 | 0
U.S. government agency securities |  | 0 | 0
Mortgage-backed securities |  | 0 | 0
State and municipal securities |  | 0 | 0
Asset-Backed Securities, at Carrying Value |  |  | 0
Agency backed securities, Fair Value Disclosure |  | 0 |
Corporate notes and other |  | 0 | 0
Total investment securities available-for-sale |  | 0 | 0
Alternative Investment |  | 0 | 0
Other assets |  | 0 | 0
Total assets at fair value |  | 0 | 0
Liabilities at fair value [Abstract] |  |  |
Other liabilities |  | 0 | 0
Total liabilities at fair value |  | 0 | 0
Fair Value, Measurements, Recurring | Models with Significant Observable Market Parameters (Level 2) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
U.S. treasury securities |  | 30,300 | 30,445
U.S. government agency securities |  | 70,159 | 180,801
Mortgage-backed securities |  | 1,310,945 | 1,263,819
State and municipal securities |  | 1,215,059 | 767,583
Asset-Backed Securities, at Carrying Value |  | 375,582 | 173,292
Corporate notes and other |  | 67,046 | 82,314
Total investment securities available-for-sale |  | 3,069,091 | 2,498,254
Alternative Investment |  | 24,369 | 24,922
Other assets |  | 24,524 | 11,812
Total assets at fair value |  | 3,117,984 | 2,534,988
Liabilities at fair value [Abstract] |  |  |
Other liabilities |  | 46,550 | 13,886
Total liabilities at fair value |  | 46,550 | 13,886
Fair Value, Measurements, Recurring | Models with Significant Unobservable Market Parameters (Level 3) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
U.S. treasury securities |  | 0 | 0
U.S. government agency securities |  | 0 | 0
Mortgage-backed securities |  | 0 | 0
State and municipal securities |  | 14,595 | 17,029
Asset-Backed Securities, at Carrying Value |  |  | 0
Agency backed securities, Fair Value Disclosure |  | 0 |
Corporate notes and other |  | 0 | 0
Total investment securities available-for-sale |  | 14,595 | 17,029
Alternative Investment |  | 26,422 | 28,874
Other assets |  | 0 | 0
Total assets at fair value |  | 41,017 | 45,903
Liabilities at fair value [Abstract] |  |  |
Other liabilities |  | 0 | 0
Total liabilities at fair value |  | 0 | 0
Fair Value, Measurements, Nonrecurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Total assets at fair value |  | 55,995 | 50,554
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract] |  |  |
Other real estate owned |  | 15,165 | 27,831
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | 40,830 | 22,723
Total losses on other real estate owned |  | 84 | (203)
Total losses on collateral dependent nonaccrual loans, net | [1] | (1,214) | (4)
Total losses |  | (1,298) | 199
Fair Value, Measurements, Nonrecurring | Quoted Market Prices in an Active Market (Level 1) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Total assets at fair value |  | 0 | 0
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract] |  |  |
Other real estate owned |  | 0 | 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | 0 | 0
Fair Value, Measurements, Nonrecurring | Models with Significant Observable Market Parameters (Level 2) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Total assets at fair value |  | 0 | 0
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract] |  |  |
Other real estate owned |  | 0 | 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | 0 | 0
Fair Value, Measurements, Nonrecurring | Models with Significant Unobservable Market Parameters (Level 3) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Total assets at fair value |  | 55,995 | 50,554
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract] |  |  |
Other real estate owned |  | 15,165 | 27,831
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | 40,830 | 22,723
Other Assets |  |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |  |
Fair value, beginning of period |  | 28,874 | 10,478
Total realized gains included in income |  | 2,932 | 605
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 | 0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets Acquired |  | 0 | 17,062
Purchases |  | 9,013 | 2,330
Issuances |  | 0 | 0
Settlements |  | (2,231) | (1,601)
Transfers out of Level 3 |  | (12,166) | 0
Fair value, December 31 |  | 26,422 | 28,874
Available-for-sale Securities |  |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |  |
Fair value, beginning of period |  | 17,029 | 0
Total realized gains included in income |  | 34 | 66
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | (1,300) | 709
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets Acquired |  | 0 | 16,254
Purchases |  | 0 | 0
Issuances |  | 0 | 0
Settlements |  | (1,168) | 0
Transfers out of Level 3 |  | 0 | 0
Fair value, December 31 |  | $ 14,595 | $ 17,029
[1] | Amount is net of a valuation allowance of $4.0 million and $2.2 million at December 31, 2018 and 2017, respectively, as required by ASC 310-10, "Receivables."

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