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Short-Term Borrowings (Short-Term Borrowings) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Short-term Debt [Line Items] |  |
Amount outstanding at period end | $ 1,589,128 | $ 1,703,890
Federal Funds Purchased [Member] |  |
Short-term Debt [Line Items] |  |
Amount outstanding at period end | 425 | 140,754
Average amount outstanding during period | 39,968 | 27,063
Maximum amount at any month end during period | $ 100,925 | $ 140,754
Weighted-average interest at period end | 2.00% | 1.00%
Weighted-average interest rate during period | 2.11% | 1.37%
Securities Sold Under Agreements to Repurchase [Member] |  |
Short-term Debt [Line Items] |  |
Amount outstanding at period end | $ 428,599 | $ 430,569
Average amount outstanding during period | 456,000 | 501,719
Maximum amount at any month end during period | $ 500,345 | $ 587,569
Weighted-average interest at period end | 0.32% | 0.17%
Weighted-average interest rate during period | 0.23% | 0.12%
FHLB Borrowings [Member] |  |
Short-term Debt [Line Items] |  |
Amount outstanding at period end | $ 1,160,104 | $ 1,132,567
Average amount outstanding during period | 1,694,804 | 1,478,114
Maximum amount at any month end during period | $ 2,410,258 | $ 2,061,652
Weighted-average interest at period end | 2.48% | 1.35%
Weighted-average interest rate during period | 2.02% | 1.00%

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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 calculated at point in time. + 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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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period. + References No definition available. + Details
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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period. + 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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