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Fair Value (Assets and liabilities on recurring and non-recurring basis) (Details) - USD ($) | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available for sale securities | $ 613,423,000 |  | $ 751,484,000 |  |  |
Money Market Funds, at Carrying Value | 6,530,000 |  | 5,606,000 |  |  |
Trading Securities | 284,000 |  | 347,000 |  |  |
Derivative Assets | 809,000 |  | 1,330,000 |  |  |
Servicing Assets | 9,818,000 |  | 9,858,000 |  |  |
Derivative liabilities | (1,677,000) |  | (2,437,000) |  |  |
Total | 629,187,000 |  | 766,188,000 |  |  |
Impaired Commercial Loan | 67,788,000 |  | 54,289,000 |  |  |
Foreclosed real estate | 47,275,000 | $ 50,223,000 | 47,520,000 | $ 45,740,000 | $ 51,220,000 | $ 58,176,000
Other repossessed assets | 3,829,000 |  | 3,224,000 |  |  |
Total | 118,892,000 |  | 105,033,000 |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available for sale securities | 0 |  | 0 |  |  |
Money Market Funds, at Carrying Value | 6,530,000 |  | 5,606,000 |  |  |
Trading Securities | 0 |  | 0 |  |  |
Derivative Assets | 0 |  | 0 |  |  |
Servicing Assets | 0 |  | 0 |  |  |
Derivative liabilities | 0 |  | 0 |  |  |
Total | 6,530,000 |  | 5,606,000 |  |  |
Impaired Commercial Loan | 0 |  | 0 |  |  |
Foreclosed real estate | 0 |  | 0 |  |  |
Other repossessed assets | 0 |  | 0 |  |  |
Total | 0 |  | 0 |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available for sale securities | 613,423,000 |  | 751,484,000 |  |  |
Money Market Funds, at Carrying Value | 0 |  | 0 |  |  |
Trading Securities | 284,000 |  | 347,000 |  |  |
Derivative Assets | 809,000 |  | 1,330,000 |  |  |
Servicing Assets | 0 |  | 0 |  |  |
Derivative liabilities | (1,677,000) |  | (2,437,000) |  |  |
Total | 612,839,000 |  | 750,724,000 |  |  |
Impaired Commercial Loan | 0 |  | 0 |  |  |
Foreclosed real estate | 0 |  | 0 |  |  |
Other repossessed assets | 0 |  | 0 |  |  |
Total | 0 |  | 0 |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available for sale securities | 0 |  | 0 |  |  |
Money Market Funds, at Carrying Value | 0 |  | 0 |  |  |
Trading Securities | 0 |  | 0 |  |  |
Derivative Assets | 0 |  | 0 |  |  |
Servicing Assets | 9,818,000 |  | 9,858,000 |  |  |
Derivative liabilities | 0 |  |  |  |  |
Total | 9,818,000 |  | 9,858,000 |  |  |
Impaired Commercial Loan | 67,788,000 |  | 54,289,000 |  |  |
Foreclosed real estate | 47,275,000 |  | 47,520,000 |  |  |
Other repossessed assets | 3,829,000 |  | 3,224,000 |  |  |
Total | 118,892,000 |  | 105,033,000 |  |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available for sale securities | 613,423,000 |  | 751,484,000 |  |  |
Money Market Funds, at Carrying Value | 6,530,000 |  | 5,606,000 |  |  |
Trading Securities | 284,000 |  | 347,000 |  |  |
Derivative Assets | 809,000 |  | 1,330,000 |  |  |
Servicing Assets | 9,818,000 |  | 9,858,000 |  |  |
Derivative liabilities | (1,677,000) |  | (2,437,000) |  |  |
Total | 629,187,000 |  | 766,188,000 |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available for sale securities | 0 |  | 0 |  |  |
Money Market Funds, at Carrying Value | 6,530,000 |  | 5,606,000 |  |  |
Trading Securities | 0 |  | 0 |  |  |
Derivative Assets | 0 |  | 0 |  |  |
Servicing Assets | 0 |  | 0 |  |  |
Derivative liabilities | 0 |  | 0 |  |  |
Total | 6,530,000 |  | 5,606,000 |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available for sale securities | 613,423,000 |  | 751,484,000 |  |  |
Money Market Funds, at Carrying Value | 0 |  | 0 |  |  |
Trading Securities | 284,000 |  | 347,000 |  |  |
Derivative Assets | 809,000 |  | 1,330,000 |  |  |
Servicing Assets | 0 |  | 0 |  |  |
Derivative liabilities | (1,677,000) |  | (2,437,000) |  |  |
Total | 612,839,000 |  | 750,724,000 |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available for sale securities | 0 |  | 0 |  |  |
Money Market Funds, at Carrying Value | 0 |  | 0 |  |  |
Trading Securities | 0 |  | 0 |  |  |
Derivative Assets | 0 |  | 0 |  |  |
Servicing Assets | 9,818,000 |  | 9,858,000 |  |  |
Derivative liabilities | 0 |  | 0 |  |  |
Total | 9,818,000 |  | 9,858,000 |  |  |
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impaired Commercial Loan | 67,788,000 |  | 54,289,000 |  |  |
Foreclosed real estate | 47,275,000 |  | 47,520,000 |  |  |
Other repossessed assets | 3,829,000 |  | 3,224,000 |  |  |
Total | 118,892,000 |  | 105,033,000 |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impaired Commercial Loan | 0 |  | 0 |  |  |
Foreclosed real estate | 0 |  | 0 |  |  |
Other repossessed assets | 0 |  | 0 |  |  |
Total | 0 |  | 0 |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impaired Commercial Loan | 0 |  | 0 |  |  |
Foreclosed real estate | 0 |  | 0 |  |  |
Other repossessed assets | 0 |  | 0 |  |  |
Total | 0 |  | 0 |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impaired Commercial Loan | 67,788,000 |  | 54,289,000 |  |  |
Foreclosed real estate | 47,275,000 |  | 47,520,000 |  |  |
Other repossessed assets | 3,829,000 |  | 3,224,000 |  |  |
Total | $ 118,892,000 |  | $ 105,033,000 |  |  |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes 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 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 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 6: 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=51825145&loc=SL20226008-175313 + Details
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