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Investment (Held-to-Maturity) Securities (Details) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |  |
Investments Securities, Amortized Cost |  | $ 392,013 | $ 461,793 | $ 490,426
Investment Securities, fair value |  | 403,384 | 480,035 | 515,675
Investment Securities, Gross Unrealized Gain |  | 14,270 | 20,508 | 26,092
Investment Securities, Gross Unrealized Loss |  | (2,899) | (2,266) | (843)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract] |  |  |  |
Investments Securities, Debt Maturities, Amortized Cost |  | 392,013 | 461,793 | 490,426
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Investment Securities, Debt Maturities, Fair Value |  | $ 403,384 | 480,035 | 515,675
Investment Securities, Debt Maturities, Nominal Yield [Abstract] |  |  |  |
Investment Securities, Debt Maturities, Nominal Yield |  | 4.26% |  |
Investment Securities, Pledged as Collateral [Abstract] |  |  |  |
Investment Securities, Pledged as Collateral, Amortized Cost |  | $ 172,906 | 226,852 | 251,684
Investment Securities, Pledged as Collateral, Fair Value |  | $ 174,240 | $ 229,429 | $ 255,097
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 167 | 150 | 105
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 141,435 | $ 166,051 | $ 123,272
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 11,140 | 12,265 | 3,000
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 152,575 | 178,316 | 126,272
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 2,389 | 1,881 | 764
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 510 | 385 | 79
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 2,899 | 2,266 | 843
Fixed Maturity Securities [Member] |  |  |  |
Investment Securities, Debt Maturities, Net Carrying Value [Abstract] |  |  |  |
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value |  | 75,412 |  |
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value |  | 114,175 |  |
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value |  | 151,879 |  |
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value |  | 36,558 |  |
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value |  | 378,024 |  |
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Investment Securities, Debt Maturities, Less Than One Year, Fair Value |  | 75,510 |  |
Investment Securities, Debt Maturities, One to Five Years, Fair Value |  | 115,969 |  |
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value |  | 161,950 |  |
Investment Securities, Debt Maturities, Over Ten Years, Fair Value |  | 35,971 |  |
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value |  | $ 389,400 |  |
Investment Securities, Debt Maturities, Nominal Yield [Abstract] |  |  |  |
Investment Securities, Debt Maturities, Less Than One Year, Nominal Yield |  | 2.45% |  |
Investment Securities, Debt Maturities, One to Five Years, Nominal Yield |  | 3.54% |  |
Investment Securities, Debt Maturities, Six to Ten Years, Nominal Yield |  | 5.69% |  |
Investment Securities, Debt Maturities, Over Ten Years, Nominal Yield |  | 4.82% |  |
Investment Securities, Debt Maturities, Nominal Yield |  | 4.31% |  |
Investment Securities, Debt Maturities, Weighted Average Maturity | [1] | 5.08 |  |
Municipal and other tax-exempt securities |  |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |  |
Investments Securities, Amortized Cost |  | $ 173,097 | 228,186 | 267,375
Investment Securities, fair value |  | 174,205 | 230,349 | 270,531
Investment Securities, Gross Unrealized Gain |  | 1,779 | 2,967 | 3,384
Investment Securities, Gross Unrealized Loss |  | (671) | (804) | (228)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract] |  |  |  |
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value |  | 60,535 |  |
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value |  | 62,005 |  |
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value |  | 28,117 |  |
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value |  | 22,440 |  |
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value |  | 173,097 |  |
Investments Securities, Debt Maturities, Amortized Cost |  | 173,097 | 228,186 | 267,375
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Investment Securities, Debt Maturities, Less Than One Year, Fair Value |  | 60,487 |  |
Investment Securities, Debt Maturities, One to Five Years, Fair Value |  | 61,736 |  |
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value |  | 29,038 |  |
Investment Securities, Debt Maturities, Over Ten Years, Fair Value |  | 22,944 |  |
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value |  | 174,205 |  |
Investment Securities, Debt Maturities, Fair Value |  | $ 174,205 | $ 230,349 | $ 270,531
Investment Securities, Debt Maturities, Nominal Yield [Abstract] |  |  |  |
Investment Securities, Debt Maturities, Less Than One Year, Nominal Yield | [2] | 2.07% |  |
Investment Securities, Debt Maturities, One to Five Years, Nominal Yield | [2] | 2.58% |  |
Investment Securities, Debt Maturities, Six to Ten Years, Nominal Yield | [2] | 5.81% |  |
Investment Securities, Debt Maturities, Over Ten Years, Nominal Yield | [2] | 5.12% |  |
Investment Securities, Debt Maturities, Nominal Yield | [2] | 3.25% |  |
Investment Securities, Debt Maturities, Weighted Average Maturity | [1] | 4.02 |  |
Investment Securities,Debt Maturities, Effective tax rate for nominal yield calculation |  | 25.00% |  |
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 84 | 100 | 82
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 98,325 | $ 145,960 | $ 111,078
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 5,007 | 5,833 | 3,000
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 103,332 | 151,793 | 114,078
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 484 | 643 | 149
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 187 | 161 | 79
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 671 | 804 | 228
Other debt securities |  |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |  |
Investments Securities, Amortized Cost |  | 204,927 | 217,716 | 205,016
Investment Securities, fair value |  | 215,195 | 233,444 | 226,502
Investment Securities, Gross Unrealized Gain |  | 12,259 | 17,095 | 22,040
Investment Securities, Gross Unrealized Loss |  | (1,991) | (1,367) | (554)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract] |  |  |  |
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value |  | 14,877 |  |
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value |  | 52,170 |  |
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value |  | 123,762 |  |
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value |  | 14,118 |  |
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value |  | 204,927 |  |
Investments Securities, Debt Maturities, Amortized Cost |  | 204,927 | 217,716 | 205,016
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Investment Securities, Debt Maturities, Less Than One Year, Fair Value |  | 15,023 |  |
Investment Securities, Debt Maturities, One to Five Years, Fair Value |  | 54,233 |  |
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value |  | 132,912 |  |
Investment Securities, Debt Maturities, Over Ten Years, Fair Value |  | 13,027 |  |
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value |  | 215,195 |  |
Investment Securities, Debt Maturities, Fair Value |  | $ 215,195 | $ 233,444 | $ 226,502
Investment Securities, Debt Maturities, Nominal Yield [Abstract] |  |  |  |
Investment Securities, Debt Maturities, Less Than One Year, Nominal Yield |  | 3.99% |  |
Investment Securities, Debt Maturities, One to Five Years, Nominal Yield |  | 4.69% |  |
Investment Securities, Debt Maturities, Six to Ten Years, Nominal Yield |  | 5.67% |  |
Investment Securities, Debt Maturities, Over Ten Years, Nominal Yield |  | 4.34% |  |
Investment Securities, Debt Maturities, Nominal Yield |  | 5.21% |  |
Investment Securities, Debt Maturities, Weighted Average Maturity | [1] | 5.99 |  |
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 80 | 49 | 22
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 36,131 | $ 20,091 | $ 8,384
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 3,324 | 3,076 | 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 39,455 | 23,167 | 8,384
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 1,795 | 1,238 | 554
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 196 | 129 | 0
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 1,991 | 1,367 | 554
U.S. government agency residential mortgage-backed securities |  |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |  |
Investments Securities, Amortized Cost |  | 13,989 | 15,891 | 18,035
Investment Securities, fair value |  | 13,984 | 16,242 | 18,642
Investment Securities, Gross Unrealized Gain |  | 232 | 446 | 668
Investment Securities, Gross Unrealized Loss |  | (237) | (95) | (61)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract] |  |  |  |
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value |  | 13,989 |  |
Investments Securities, Debt Maturities, Amortized Cost |  | 13,989 | 15,891 | 18,035
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value |  | 13,984 |  |
Investment Securities, Debt Maturities, Fair Value |  | $ 13,984 | $ 16,242 | $ 18,642
Investment Securities, Debt Maturities, Nominal Yield [Abstract] |  |  |  |
Investment Securities, Debt Maturities, Nominal Yield | [3] | 2.76% |  |
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  | 5 years |  |
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 3 | 1 | 1
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 6,979 | $ 0 | $ 3,810
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 2,809 | 3,356 | 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 9,788 | 3,356 | 3,810
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 110 | 0 | 61
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 127 | 95 | 0
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ 237 | $ 95 | $ 61
[1] | Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.
[2] | Calculated on a taxable equivalent basis using a 25 percent effective tax rate.
[3] | The nominal yield on residential mortgage-backed securities is based upon prepayment assumptions at the purchase date. Actual yields earned may differ significantly based upon actual prepayments. See Quarterly Financial Summary - Unaudited for current yields on the investment securities portfolio.

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- Definition Represents fair value as of the balance sheet date for held-to-maturity securities pledged as collateral for repurchase agreements, public and trust funds on deposit and for other purposes, as required by law for which the secured party does not have the right to sell or re-pledge. + References No definition available. + Details
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- Definition Nominal yield on the securities maturing in the next rolling twelve months following the latest balance sheet presented, as calculated from its issuance value or purchase price. + References No definition available. + Details
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- Definition Nominal yield on the securities maturing after the tenth rolling twelve months following the latest balance sheet presented, as calculated from its issuance value or purchase price. + References No definition available. + Details
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- Definition Effective tax rate for nominal yield calculation for investment (held-to-maturity) securities. + References No definition available. + Details
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- Definition The calculated weighted-average expected life of mortgage-backed securities held to maturity based on prepayment assumptions as of the balance sheet date. + References No definition available. + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount of held-to-maturity debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition The carrying amount of held-to-maturity securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 + Details
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