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Business Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Fixed income | $ 278,789 | $ 167,882 | $ 216,625
Deposit transactions and cash management | 131,663 | 133,281 | 110,592
Brokerage, management fees and commissions | 55,467 | 54,803 | 48,514
Trust services and investment management | 29,511 | 29,806 | 28,420
Bankcard income | 28,308 | 29,304 | 26,435
Bank-owned life insurance (BOLI) | 19,210 | 18,955 | 15,124
Debt securities gains/(losses), net | (267) | 52 | 483
Equity securities gains/(losses), net | 441 | 212,896 | 109
Other income/(loss) | 110,958 | 75,809 | 43,917
Total noninterest income | 654,080 | 722,788 | 490,219
Gain on sale of TRUPs loans | 1,105 | 3,777 | 0
Visa Class B Shares |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Gain on sale of investments |  | 212,900 |
Underwriting, Portfolio Advisory, and Other Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 33,700 | 28,900 |
Regional Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Fixed income | 122 | 417 | 430
Deposit transactions and cash management | 124,832 | 126,832 | 105,058
Brokerage, management fees and commissions | 55,462 | 54,800 | 48,513
Trust services and investment management | 29,600 | 29,852 | 28,491
Bankcard income | 28,540 | 29,434 | 25,983
Bank-owned life insurance (BOLI) | 0 | 0 | 0
Debt securities gains/(losses), net | 0 | 0 | 386
Equity securities gains/(losses), net | 0 | 0 | 0
Other income/(loss) | 91,278 | 70,428 | 50,685
Total noninterest income | 329,834 | 311,763 | 259,546
Fixed Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Fixed income | 277,561 | 163,382 | 216,195
Deposit transactions and cash management | 4 | 12 | 3
Brokerage, management fees and commissions | 0 | 0 | 0
Trust services and investment management | 0 | 0 | 0
Bankcard income | 11 | 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) | 847 | 1,375 | 888
Total noninterest income | 278,423 | 164,769 | 217,086
Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Fixed income | 0 | 0 | 0
Deposit transactions and cash management | 6,610 | 6,214 | 5,338
Brokerage, management fees and commissions | 0 | 0 | 1
Trust services and investment management | (89) | (46) | (71)
Bankcard income | 248 | 226 | 225
Bank-owned life insurance (BOLI) | 19,210 | 18,955 | 15,124
Debt securities gains/(losses), net | (267) | 52 | 97
Equity securities gains/(losses), net | 441 | 212,896 | 109
Other income/(loss) | 15,204 | 966 | (11,936)
Total noninterest income | 41,357 | 239,263 | 8,887
(Gain)/loss on securities |  |  | 14,300
Non-Strategic |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Fixed income | 1,106 | 4,083 | 0
Deposit transactions and cash management | 217 | 223 | 193
Brokerage, management fees and commissions | 5 | 3 | 0
Trust services and investment management | 0 | 0 | 0
Bankcard income | (491) | (356) | 227
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) | 3,629 | 3,040 | 4,280
Total noninterest income | 4,466 | 6,993 | $ 4,700
Gain on sale of TRUPs loans | $ 1,100 | $ 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 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=116637391&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=116654751&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 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=116637232&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=118932676&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=116637391&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=116634182&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=116634182&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=116637391&loc=SL114874048-224260 + Details
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