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Business Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Fixed income | $ 53,749 | $ 45,506
Deposit transactions and cash management | 31,621 | 35,984
Brokerage, management fees and commissions | 12,633 | 13,483
Trust services and investment management | 7,026 | 7,277
Bankcard income | 6,015 | 6,445
Bank-owned life insurance (BOLI) | 4,402 | 3,993
Debt securities gains/(losses), net | 0 | 52
Equity securities gains/(losses), net | 31 | 34
All other income and commissions (Note 8) | 25,568 | 23,243
Total noninterest income | 141,045 | 136,017
Gain on sale of a building |  | 3,300
Regional Banking |  |
Disaggregation of Revenue [Line Items] |  |
Fixed income | 17 | 81
Deposit transactions and cash management | 30,005 | 34,722
Brokerage, management fees and commissions | 12,629 | 13,483
Trust services and investment management | 7,056 | 7,292
Bankcard income | 6,102 | 6,279
Bank-owned life insurance (BOLI) | 0 | 0
Debt securities gains/(losses), net | 0 | 0
Equity securities gains/(losses), net | 0 | 0
All other income and commissions (Note 8) | 16,308 | 18,106
Total noninterest income | 72,117 | 79,963
Fixed Income |  |
Disaggregation of Revenue [Line Items] |  |
Fixed income | 53,732 | 45,425
Deposit transactions and cash management | 3 | 3
Brokerage, management fees and commissions | 0 | 0
Trust services and investment management | 0 | 0
Bankcard income | 0 | 0
Bank-owned life insurance (BOLI) | 0 | 0
Debt securities gains/(losses), net | 0 | 0
Equity securities gains/(losses), net | 0 | 0
All other income and commissions (Note 8) | 72 | 177
Total noninterest income | 53,807 | 45,605
Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Fixed income | 0 | 0
Deposit transactions and cash management | 1,563 | 1,209
Brokerage, management fees and commissions | 0 | 0
Trust services and investment management | (30) | (15)
Bankcard income | 62 | 56
Bank-owned life insurance (BOLI) | 4,402 | 3,993
Debt securities gains/(losses), net | 0 | 52
Equity securities gains/(losses), net | 31 | 34
All other income and commissions (Note 8) | 7,324 | 3,987
Total noninterest income | 13,352 | 9,316
Non-Strategic |  |
Disaggregation of Revenue [Line Items] |  |
Fixed income | 0 | 0
Deposit transactions and cash management | 50 | 50
Brokerage, management fees and commissions | 4 | 0
Trust services and investment management | 0 | 0
Bankcard income | (149) | 110
Bank-owned life insurance (BOLI) | 0 | 0
Debt securities gains/(losses), net | 0 | 0
Equity securities gains/(losses), net | 0 | 0
All other income and commissions (Note 8) | 1,864 | 973
Total noninterest income | 1,769 | 1,133
Underwriting, Portfolio Advisory, and Other Noninterest Income |  |
Disaggregation of Revenue [Line Items] |  |
Fixed income | $ 7,300 | $ 8,200

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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=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 real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 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 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 + 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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