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Short-Term Borrowings (Short-Term Borrowings) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Short-term Debt [Line Items] |  |
Amount outstanding at period end | $ 1,703,890 | $ 1,225,406
Federal Funds Purchased [Member] |  |
Short-term Debt [Line Items] |  |
Amount outstanding at period end | 140,754 | 2,275
Average amount outstanding during period | 27,063 | 14,052
Maximum amount at any month end during period | $ 140,754 | $ 59,475
Weighted-average interest at period end | 1.00% | 0.38%
Weighted-average interest rate during period | 1.37% | 0.50%
Securities Sold Under Agreements to Repurchase [Member] |  |
Short-term Debt [Line Items] |  |
Amount outstanding at period end | $ 430,569 | $ 358,131
Average amount outstanding during period | 501,719 | 454,571
Maximum amount at any month end during period | $ 587,569 | $ 579,099
Weighted-average interest at period end | 0.17% | 0.04%
Weighted-average interest rate during period | 0.12% | 0.03%
FHLB Borrowings [Member] |  |
Short-term Debt [Line Items] |  |
Amount outstanding at period end | $ 1,132,567 | $ 865,000
Average amount outstanding during period | 1,478,114 | 943,570
Maximum amount at any month end during period | $ 2,061,652 | $ 1,175,000
Weighted-average interest at period end | 1.35% | 0.54%
Weighted-average interest rate during period | 1.00% | 0.41%

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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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(a)(16)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Weighted average interest rate of short-term debt outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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