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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Valuation allowance |  | $ 2,328 |  | $ 2,198
Recurring |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
U.S. Treasury securities |  | 30,780 |  | 30,445
U.S. government agency securities |  | 173,229 |  | 180,801
Mortgage-backed securities |  | 1,239,031 |  | 1,263,819
State and municipal securities |  | 1,207,181 |  | 784,612
Agency-backed securities |  | 240,446 |  | 173,292
Corporate notes and other |  | 69,461 |  | 82,314
Total investment securities available-for-sale |  | 2,960,128 |  | 2,515,283
Other Investments |  | 47,983 |  | 28,874
Other assets |  | 27,494 |  | 11,812
Total assets at fair value |  | 3,035,605 |  | 2,555,969
Liabilities at fair value: [Abstract] |  |  |  |
Other liabilities |  | 23,712 |  | 13,886
Total liabilities at fair value |  | 23,712 |  | 13,886
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
Agency-backed securities |  | 0 |  | 0
Corporate notes and other |  | 0 |  | 0
Total investment securities available-for-sale |  | 0 |  | 0
Other Investments |  | 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
Recurring | Models with significant observable market parameters (Level 2) |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
U.S. Treasury securities |  | 30,780 |  | 30,445
U.S. government agency securities |  | 173,229 |  | 180,801
Mortgage-backed securities |  | 1,239,031 |  | 1,263,819
State and municipal securities |  | 1,191,891 |  | 767,583
Agency-backed securities |  | 240,446 |  | 173,292
Corporate notes and other |  | 69,461 |  | 82,314
Total investment securities available-for-sale |  | 2,944,838 |  | 2,498,254
Other Investments |  | 24,405 |  | 0
Other assets |  | 27,494 |  | 11,812
Total assets at fair value |  | 2,996,737 |  | 2,510,066
Liabilities at fair value: [Abstract] |  |  |  |
Other liabilities |  | 23,712 |  | 13,886
Total liabilities at fair value |  | 23,712 |  | 13,886
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 |  | 15,290 |  | 17,029
Agency-backed securities |  | 0 |  | 0
Corporate notes and other |  | 0 |  | 0
Total investment securities available-for-sale |  | 15,290 |  | 17,029
Other Investments |  | 23,578 |  | 28,874
Other assets |  | 0 |  | 0
Total assets at fair value |  | 38,868 |  | 45,903
Liabilities at fair value: [Abstract] |  |  |  |
Other liabilities |  | 0 |  | 0
Total liabilities at fair value |  | 0 |  | 0
Nonrecurring |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Total assets at fair value |  | 55,333 |  | 50,554
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Total losses on impaired loans, net |  | (35) | [1] | (4)
Gain loss on Other real estate owned |  | 15 |  | 203
Nonaccrual loans, net | [1] | 35,548 |  | 22,723
Other real estate owned |  | 19,785 |  | 27,831
Total gains (losses) for the year-to-date period then ended |  | (20) |  | 199
Nonrecurring | Quoted market prices in an active market (Level 1) |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Total assets at fair value |  | 0 |  | 0
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Nonaccrual loans, net | [1] | 0 |  | 0
Other real estate owned |  | 0 |  | 0
Nonrecurring | Models with significant observable market parameters (Level 2) |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Total assets at fair value |  | 0 |  | 0
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Nonaccrual loans, net | [1] | 0 |  | 0
Other real estate owned |  | 0 |  | 0
Nonrecurring | Models with significant unobservable market parameters (Level 3) |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Total assets at fair value |  | 55,333 |  | 50,554
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Nonaccrual loans, net | [1] | 35,548 |  | 22,723
Other real estate owned |  | $ 19,785 |  | $ 27,831
[1] | Amount is net of valuation allowance of $2.3 million and $2.2 million at June 30, 2018 and December 31, 2017, respectively, as required by ASC 310-10, "Receivables."

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents US government treasury and federal agency issued securities. + References No definition available. + Details
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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=99392525&loc=SL7495116-110257 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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