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Fair Value Measurement and Fair Value of Financial Instruments (Carrying and Fair Values per the Fair Value Hierarchy of Certain Financial Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Financial assets: |  |  |  |
Cash and cash equivalents | $ 2,174,592 | $ 1,878,503 | $ 1,360,887 | $ 1,039,885
Interest-bearing deposits with banks | 398,422 | 323,148 |  |
Resale agreements | 1,050,000 | 2,000,000 |  |
Held-to-maturity investment security | 0 | 143,971 |  |
Restricted equity securities, at cost | 73,521 | 72,775 |  |
Loans held-for-sale | 85 | 23,076 |  |
Loans held-for-investment, net | 28,688,590 | 25,242,619 |  |
Branch assets held-for-sale | 91,318 | 0 |  |
Customer deposits: |  |  |  |
Demand, checking, savings and money market deposits | 25,974,314 | 24,275,714 |  |
Time deposits | 5,640,749 | 5,615,269 |  |
Short-term borrowings | 0 | 60,050 |  |
Federal Home Loan Bank (“FHLB”) advances | 323,891 | 321,643 |  |
Repurchase agreements | 50,000 | 350,000 |  |
Long-term debt | 171,577 | 186,327 |  |
Carrying amount of repurchase agreements eligible for netting against resale agreements | 400,000 | 100,000 |  |
Gross repurchase agreements | 450,000 | 450,000 |  |
Carrying Amount |  |  |  |
Financial assets: |  |  |  |
Cash and cash equivalents | 2,174,592 | 1,878,503 |  |
Interest-bearing deposits with banks | 398,422 | 323,148 |  |
Resale agreements | 1,050,000 | 2,000,000 |  |
Held-to-maturity investment security |  | 143,971 |  |
Restricted equity securities, at cost | 73,521 | 72,775 |  |
Loans held-for-sale | 85 | 23,076 |  |
Loans held-for-investment, net | 28,688,590 | 25,242,619 |  |
Branch assets held-for-sale | 91,318 |  |  |
Accrued interest receivable | 121,719 | 100,524 |  |
Customer deposits: |  |  |  |
Demand, checking, savings and money market deposits | 25,974,314 | 24,275,714 |  |
Time deposits | 5,640,749 | 5,615,269 |  |
Branch liability held-for-sale | 605,111 |  |  |
Short-term borrowings |  | 60,050 |  |
Federal Home Loan Bank (“FHLB”) advances | 323,891 | 321,643 |  |
Repurchase agreements | 50,000 | 350,000 |  |
Long-term debt | 171,577 | 186,327 |  |
Accrued interest payable | 10,724 | 9,440 |  |
Fair Value Measurements |  |  |  |
Financial assets: |  |  |  |
Cash and cash equivalents | 2,174,592 | 1,878,503 |  |
Interest-bearing deposits with banks | 398,422 | 323,148 |  |
Resale agreements | 1,035,158 | 1,980,457 |  |
Held-to-maturity investment security |  | 144,593 |  |
Restricted equity securities, at cost | 73,521 | 72,775 |  |
Loans held-for-sale | 85 | 23,076 |  |
Loans held-for-investment, net | 28,956,349 | 24,915,143 |  |
Branch assets held-for-sale | 94,245 |  |  |
Accrued interest receivable | 121,719 | 100,524 |  |
Customer deposits: |  |  |  |
Demand, checking, savings and money market deposits | 25,974,314 | 24,275,714 |  |
Time deposits | 5,626,855 | 5,611,746 |  |
Branch liability held-for-sale | 643,937 |  |  |
Short-term borrowings |  | 60,050 |  |
Federal Home Loan Bank (“FHLB”) advances | 335,901 | 334,859 |  |
Repurchase agreements | 104,830 | 411,368 |  |
Long-term debt | 171,673 | 186,670 |  |
Accrued interest payable | 10,724 | 9,440 |  |
Fair Value Measurements | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Financial assets: |  |  |  |
Cash and cash equivalents | 2,174,592 | 1,878,503 |  |
Interest-bearing deposits with banks | 0 | 0 |  |
Resale agreements | 0 | 0 |  |
Held-to-maturity investment security |  | 0 |  |
Restricted equity securities, at cost | 0 | 0 |  |
Loans held-for-sale | 0 | 0 |  |
Loans held-for-investment, net | 0 | 0 |  |
Branch assets held-for-sale | 5,143 |  |  |
Accrued interest receivable | 0 | 0 |  |
Customer deposits: |  |  |  |
Demand, checking, savings and money market deposits | 0 | 0 |  |
Time deposits | 0 | 0 |  |
Branch liability held-for-sale | 0 |  |  |
Short-term borrowings |  | 0 |  |
Federal Home Loan Bank (“FHLB”) advances | 0 | 0 |  |
Repurchase agreements | 0 | 0 |  |
Long-term debt | 0 | 0 |  |
Accrued interest payable | 0 | 0 |  |
Fair Value Measurements | Significant Other Observable Inputs (Level 2) |  |  |  |
Financial assets: |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Interest-bearing deposits with banks | 398,422 | 323,148 |  |
Resale agreements | 1,035,158 | 1,980,457 |  |
Held-to-maturity investment security |  | 0 |  |
Restricted equity securities, at cost | 73,521 | 72,775 |  |
Loans held-for-sale | 85 | 23,076 |  |
Loans held-for-investment, net | 0 | 0 |  |
Branch assets held-for-sale | 10,970 |  |  |
Accrued interest receivable | 121,719 | 100,524 |  |
Customer deposits: |  |  |  |
Demand, checking, savings and money market deposits | 25,974,314 | 24,275,714 |  |
Time deposits | 5,626,855 | 5,611,746 |  |
Branch liability held-for-sale | 0 |  |  |
Short-term borrowings |  | 60,050 |  |
Federal Home Loan Bank (“FHLB”) advances | 335,901 | 334,859 |  |
Repurchase agreements | 104,830 | 411,368 |  |
Long-term debt | 171,673 | 186,670 |  |
Accrued interest payable | 10,724 | 9,440 |  |
Fair Value Measurements | Significant Unobservable Inputs (Level 3) |  |  |  |
Financial assets: |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Interest-bearing deposits with banks | 0 | 0 |  |
Resale agreements | 0 | 0 |  |
Held-to-maturity investment security |  | 144,593 |  |
Restricted equity securities, at cost | 0 | 0 |  |
Loans held-for-sale | 0 | 0 |  |
Loans held-for-investment, net | 28,956,349 | 24,915,143 |  |
Branch assets held-for-sale | 78,132 |  |  |
Accrued interest receivable | 0 | 0 |  |
Customer deposits: |  |  |  |
Demand, checking, savings and money market deposits | 0 | 0 |  |
Time deposits | 0 | 0 |  |
Branch liability held-for-sale | 643,937 |  |  |
Short-term borrowings |  | 0 |  |
Federal Home Loan Bank (“FHLB”) advances | 0 | 0 |  |
Repurchase agreements | 0 | 0 |  |
Long-term debt | 0 | 0 |  |
Accrued interest payable | $ 0 | $ 0 |  |

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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement, assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(2)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 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(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 + Details
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