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Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 11, 2017 | Aug. 24, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Minimum future rental payments: |  |  |  |  |
2019 |  |  | $ 10,947 |  |
2020 |  |  | 9,766 |  |
2021 |  |  | 8,729 |  |
2022 |  |  | 8,102 |  |
2023 |  |  | 6,796 |  |
Thereafter |  |  | 18,703 |  |
Total minimum payments |  |  | 63,043 |  |
Operating Leases, Rent Expense, Sublease Rentals |  |  | 1,200 | $ 791 | $ 992
Operating Leases, Rent Expense, Net |  |  | 9,600 | 7,900 | $ 8,700
Commitments to Extend Credit [Member] |  |  |  |  |
Minimum future rental payments: |  |  |  |  |
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability |  |  | 2,620,000 | 2,620,000 |
Standby Letters of Credit [Member] |  |  |  |  |
Minimum future rental payments: |  |  |  |  |
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability |  |  | 28,300 | 51,300 |
Commercial Letter of Credit and other off-balance sheet liabilities [Member] |  |  |  |  |
Minimum future rental payments: |  |  |  |  |
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability |  |  | 0 | $ 159 |
IDAHO |  |  |  |  |
Minimum future rental payments: |  |  |  |  |
Sale Leaseback Transaction, Date | August 11, 2017 |  |  |  |
Sale Leaseback Transaction, Monthly Rental Payments |  |  | 26 |  |
Sale Leaseback Transaction, Deferred Gain, Gross | $ 509 |  |  |  |
Sale Leaseback Transaction, Deferred Gain, Net |  |  | 444 |  |
WASHINGTON |  |  |  |  |
Minimum future rental payments: |  |  |  |  |
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 |  |  | $ 575 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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