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Business Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |  |  |
Fixed income |  |  | $ 167,882 | $ 216,625 | $ 268,561
Deposit transactions and cash management |  |  | 133,281 | 110,592 | 108,553
Brokerage, management fees and commissions |  |  | 54,803 | 48,514 | 42,911
Trust services and investment management |  |  | 29,806 | 28,420 | 27,727
Bankcard income |  |  | 26,718 | 25,467 | 24,430
Bank-owned life insurance (BOLI) |  |  | 18,955 | 15,124 | 14,687
Debt securities gains/(losses), net |  |  | 52 | 483 | 1,485
Equity securities gains/(losses), net |  |  | 212,896 | 109 | (144)
Other income/(loss) |  |  | 78,395 | 44,885 | 64,231
Total noninterest income |  |  | 722,788 | 490,219 | 552,441
Gain on sale of TRUPs loans |  |  | 3,777 | 0 | 0
All other income and commissions |  |  | 1,320 | (6,657) | (3,447)
Visa Class B Shares |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Gain on sale of investments | $ 212,900 |  | 212,900 |  |
Underwriting, Portfolio Advisory, and Other Noninterest Income |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer |  |  | 28,900 |  |
Regional Banking |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Fixed income |  |  | 417 | 430 | 79
Deposit transactions and cash management |  |  | 126,909 | 105,163 | 103,122
Brokerage, management fees and commissions |  |  | 54,800 | 48,513 | 42,911
Trust services and investment management |  |  | 29,852 | 28,491 | 27,764
Bankcard income |  |  | 26,848 | 25,014 | 23,945
Bank-owned life insurance (BOLI) |  |  | 0 | 0 | 0
Debt securities gains/(losses), net |  |  | 0 | 386 | 0
Equity securities gains/(losses), net |  |  | 0 | 0 | 0
Other income/(loss) |  |  | 70,482 | 50,630 | 51,175
Total noninterest income |  |  | 309,308 | 258,627 | 248,996
Fixed Income |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Fixed income |  |  | 163,382 | 216,195 | 268,482
Deposit transactions and cash management |  |  | 12 | 3 | 3
Brokerage, management fees and commissions |  |  | 0 | 0 | 0
Trust services and investment management |  |  | 0 | 0 | 0
Bankcard income |  |  | 0 | 0 | 0
Bank-owned life insurance (BOLI) |  |  | 0 | 0 | 0
Debt securities gains/(losses), net |  |  | 0 | 0 | 0
Equity securities gains/(losses), net |  |  | 0 | 0 | 0
Other income/(loss) |  |  | 1,373 | 884 | 859
Total noninterest income |  |  | 164,767 | 217,082 | 269,344
Corporate |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Fixed income |  |  | 0 | 0 | 0
Deposit transactions and cash management |  |  | 6,144 | 5,236 | 5,250
Brokerage, management fees and commissions |  |  | 0 | 1 | 0
Trust services and investment management |  |  | (46) | (71) | (37)
Bankcard income |  |  | 226 | 225 | 215
Bank-owned life insurance (BOLI) |  |  | 18,955 | 15,124 | 14,687
Debt securities gains/(losses), net |  |  | 52 | 97 | 1,485
Equity securities gains/(losses), net |  |  | 212,896 | 109 | (144)
Other income/(loss) |  |  | 1,025 | (11,843) | (1,003)
Total noninterest income |  |  | 239,252 | 8,878 | 20,453
(Gain)/loss on securities |  | $ 14,300 |  | 14,300 |
Non-Strategic |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Fixed income |  |  | 4,083 | 0 | 0
Deposit transactions and cash management |  |  | 216 | 190 | 178
Brokerage, management fees and commissions |  |  | 3 | 0 | 0
Trust services and investment management |  |  | 0 | 0 | 0
Bankcard income |  |  | (356) | 228 | 270
Bank-owned life insurance (BOLI) |  |  | 0 | 0 | 0
Debt securities gains/(losses), net |  |  | 0 | 0 | 0
Equity securities gains/(losses), net |  |  | 0 | 0 | 0
Other income/(loss) |  |  | 5,515 | 5,214 | 13,200
Total noninterest income |  |  | 9,461 | $ 5,632 | $ 13,648
Gain on sale of TRUPs loans |  |  | $ 4,100 |  |

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- Definition Acting as an agent, a broker-dealer may buy and sell securities on behalf of its customers. In return for such services, the broker-dealer charges a commission. Each time a customer enters into a buy or sell transaction, a commission is earned by the broker-dealer for its selling and administrative efforts. For securities purchased, the commission is recorded as a receivable from customers; for securities sold, it is recorded as reductions in the payable to customers. Commissions earned are usually related to the broker-dealer's customers' trading volume and the dollar amounts of the trades. In general, commissions are for smaller trades of exchange-listed stocks and bonds made by retail customers. Revenue recognized in the period for (1) performance (incentive) fees based on the investment results achieved for management of certain institutional accounts and hedge funds, (2) schedule-based fees earned for management of mutual funds and closed-end funds, based either on average daily net assets or on a combination of the average daily net assets and gross income, and (3) other investment management and advisory fees. + References No definition available. + Details
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- Definition The major component of revenue in this line item is generated from the purchase and sale of securities as both principal and agent, and from other fee sources including loan sales, portfolio advisory, and derivative sales. + References No definition available. + Details
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- Definition Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References No definition available. + Details
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- Definition Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714 + Details
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- Definition The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence. + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(a)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(9)(a)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(7)(c)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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