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Investment Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Amortized Cost | $ 1,028,883 | $ 1,097,645
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Estimated Fair Value | 1,003,421 | 1,091,881
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
U.S. Government sponsored entities’ asset-backed securities | 351,808 | 357,197
Fair value of securities held-to-maturity | 351,422 | 363,779
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Amortized Cost |  | 245,000
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Estimated Fair Value |  | 242,720
Obligations of States and Political Subdivisions |  |
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 4,036 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | $ 3,987 |
held to maturity securities weighted avg yield yrs 5-10 | 3.04% |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost | $ 301,242 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | $ 301,821 |
Debt Securities, Held-to-maturity, Maturity, after 10 Years, Weighted Average Yield | 3.69% |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
U.S. Government sponsored entities’ asset-backed securities | $ 305,278 | 300,412
Fair value of securities held-to-maturity | 305,808 | 306,274
U.S. Government sponsored entity asset-backed securities |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Amortized Cost | 1,028,883 | 852,645
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Estimated Fair Value | $ 1,003,421 | 849,161
Available for Sale Securities Weighted Avg Yield | 2.35% |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
U.S. Government sponsored entities’ asset-backed securities | $ 46,530 | 56,785
Fair value of securities held-to-maturity | $ 45,614 | $ 57,505
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Held to Maturity Securities weighted avg yield | 2.83% |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity), maturing after tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Industry Guide -Number 3 -Section II -Paragraph B + Details
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