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Fair Value (Assets and liabilities on recurring and non-recurring basis) (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available for sale securities | $ 801,641,000 | $ 645,797,000 |  |
Money Market Funds, at Carrying Value | 7,428,000 | 7,021,000 |  |
Trading Securities | 293,000 | 191,000 |  |
Derivative Assets | 898,000 | 771,000 |  |
Servicing Assets | 10,533,000 | 9,821,000 |  |
Derivative liabilities | (752,000) | (1,281,000) |  |
Total | 820,041,000 | 662,320,000 |  |
Impaired Commercial Loan | 68,580,000 | 72,285,000 |  |
Foreclosed real estate | 40,314,000 | 44,174,000 | $ 47,551,000 | $ 47,520,000
Other repossessed assets | 5,082,000 | 3,548,000 |  |
Total | 113,976,000 | 120,007,000 |  |
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 | 7,428,000 | 7,021,000 |  |
Trading Securities | 0 | 0 |  |
Derivative Assets | 0 | 0 |  |
Servicing Assets | 0 | 0 |  |
Derivative liabilities | 0 | 0 |  |
Total | 7,428,000 | 7,021,000 |  |
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 | 801,641,000 | 645,797,000 |  |
Money Market Funds, at Carrying Value | 0 | 0 |  |
Trading Securities | 293,000 | 191,000 |  |
Derivative Assets | 898,000 | 771,000 |  |
Servicing Assets | 0 | 0 |  |
Derivative liabilities | (752,000) | (1,281,000) |  |
Total | 802,080,000 | 645,478,000 |  |
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 | 10,533,000 | 9,821,000 |  |
Derivative liabilities | 0 | 0 |  |
Total | 10,533,000 | 9,821,000 |  |
Impaired Commercial Loan | 68,580,000 | 72,285,000 |  |
Foreclosed real estate | 40,314,000 | 44,174,000 |  |
Other repossessed assets | 5,082,000 | 3,548,000 |  |
Total | 113,976,000 | 120,007,000 |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available for sale securities | 801,641,000 | 645,797,000 |  |
Money Market Funds, at Carrying Value | 7,428,000 | 7,021,000 |  |
Trading Securities | 293,000 | 191,000 |  |
Derivative Assets | 898,000 | 771,000 |  |
Servicing Assets | 10,533,000 | 9,821,000 |  |
Derivative liabilities | (752,000) | (1,281,000) |  |
Total | 820,041,000 | 662,320,000 |  |
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 | 7,428,000 | 7,021,000 |  |
Trading Securities | 0 | 0 |  |
Derivative Assets | 0 | 0 |  |
Servicing Assets | 0 | 0 |  |
Derivative liabilities | 0 | 0 |  |
Total | 7,428,000 | 7,021,000 |  |
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 | 801,641,000 | 645,797,000 |  |
Money Market Funds, at Carrying Value | 0 | 0 |  |
Trading Securities | 293,000 | 191,000 |  |
Derivative Assets | 898,000 | 771,000 |  |
Servicing Assets | 0 | 0 |  |
Derivative liabilities | (752,000) | (1,281,000) |  |
Total | 802,080,000 | 645,478,000 |  |
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 | 10,533,000 | 9,821,000 |  |
Derivative liabilities | 0 | 0 |  |
Total | 10,533,000 | 9,821,000 |  |
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impaired Commercial Loan | 68,580,000 | 72,285,000 |  |
Foreclosed real estate | 40,314,000 | 44,174,000 |  |
Other repossessed assets | 5,082,000 | 3,548,000 |  |
Total | 113,976,000 | 120,007,000 |  |
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 | 68,580,000 | 72,285,000 |  |
Foreclosed real estate | 40,314,000 | 44,174,000 |  |
Other repossessed assets | 5,082,000 | 3,548,000 |  |
Total | $ 113,976,000 | $ 120,007,000 |  |

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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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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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