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Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 24, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Minimum future rental payments: |  |  |  |
2016 |  | $ 8,891 |  |
2017 |  | 8,184 |  |
2018 |  | 7,355 |  |
2019 |  | 6,514 |  |
2020 |  | 5,138 |  |
Thereafter |  | 13,474 |  |
Total minimum payments |  | 49,556 |  |
Operating Leases, Rent Expense, Sublease Rentals |  | 992 | $ 1,100 | $ 756
Operating Leases, Rent Expense, Net |  | 8,700 | 7,400 | $ 8,300
Sale Leaseback Transaction, Date | August 24, 2016 |  |  |
Sale Leaseback Transaction, Monthly Rental Payments |  | 12 |  |
Sale Leaseback Transaction, Deferred Gain, Gross | $ 742 |  |  |
Sale Leaseback Transaction, Deferred Gain, Net |  | 713 |  |
Commitments to Extend Credit [Member] |  |  |  |
Minimum future rental payments: |  |  |  |
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability |  | 2,170,000 | 1,930,000 |
Standby Letters of Credit [Member] |  |  |  |
Minimum future rental payments: |  |  |  |
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability |  | 49,700 | 38,700 |
Commercial Letter of Credit and other off-balance sheet liabilities [Member] |  |  |  |
Minimum future rental payments: |  |  |  |
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability |  | 3,400 | $ 5,000 |
Branch consolidation [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Restructuring and Related Cost, Incurred Cost |  | 883 |  |
Minimum future rental payments: |  |  |  |
Increase (Decrease) in Restructuring Reserve |  | $ 849 |  |

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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