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v3.19.1

Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Valuation allowance |  | $ 5,518 |  | $ 3,964
Recurring |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
U.S. Treasury securities |  | 48,612 |  | 30,300
U.S. government agency securities |  | 66,969 |  | 70,159
Mortgage-backed securities |  | 1,359,721 |  | 1,310,945
State and municipal securities |  | 1,450,731 |  | 1,229,654
Agency-backed securities |  | 269,010 |  | 375,582
Corporate notes and other |  | 54,963 |  | 67,046
Total investment securities available-for-sale |  | 3,250,006 |  | 3,083,686
Other Investments |  | 52,806 |  | 50,791
Other assets |  | 27,943 |  | 24,524
Total assets at fair value |  | 3,330,755 |  | 3,159,001
Liabilities at fair value: [Abstract] |  |  |  |
Other liabilities |  | 64,746 |  | 46,550
Total liabilities at fair value |  | 64,746 |  | 46,550
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 |  | 48,612 |  | 30,300
U.S. government agency securities |  | 66,969 |  | 70,159
Mortgage-backed securities |  | 1,359,721 |  | 1,310,945
State and municipal securities |  | 1,437,001 |  | 1,215,059
Agency-backed securities |  | 269,010 |  | 375,582
Corporate notes and other |  | 54,963 |  | 67,046
Total investment securities available-for-sale |  | 3,236,276 |  | 3,069,091
Other Investments |  | 24,699 |  | 24,369
Other assets |  | 27,943 |  | 24,524
Total assets at fair value |  | 3,288,918 |  | 3,117,984
Liabilities at fair value: [Abstract] |  |  |  |
Other liabilities |  | 64,746 |  | 46,550
Total liabilities at fair value |  | 64,746 |  | 46,550
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 |  | 13,730 |  | 14,595
Agency-backed securities |  | 0 |  | 0
Corporate notes and other |  | 0 |  | 0
Total investment securities available-for-sale |  | 13,730 |  | 14,595
Other Investments |  | 28,107 |  | 26,422
Other assets |  | 0 |  | 0
Total assets at fair value |  | 41,837 |  | 41,017
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 |  | 62,767 |  | 55,995
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | 47,690 |  | 40,830
Other real estate owned |  | 15,077 |  | 15,165
Gain (Loss) on Other real estate owned |  | 50 |  | (84)
Total losses on impaired loans, net |  | (1,113) | [1] | (1,214)
Total gains (losses) for the year-to-date period then ended |  | (1,063) |  | (1,298)
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] |  |  |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [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] |  |  |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [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 |  | 62,767 |  | 55,995
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | [1] | 47,690 |  | 40,830
Other real estate owned |  | $ 15,077 |  | $ 15,165
[1] | Amount is net of valuation allowance of $5.5 million and $4.0 million at March 31, 2019 and December 31, 2018, 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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