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Note 11 - Fair Value of Financial Instruments - Fair Value Measured on a Recurring Basis (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Securities available for sale, fair value | $ 808,653,000 | $ 822,655,000
Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale, fair value | 554,481,000 | 557,953,000
Other Securities [Member] |  |
Securities available for sale, fair value | 1,303,000 | 1,256,000
Fair Value, Recurring [Member] |  |
Total assets | 810,288,000 | 838,616,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 63,561,000 | 44,088,000
Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale, fair value | 554,481,000 | 557,953,000
Fair Value, Recurring [Member] | Other Securities [Member] |  |
Securities available for sale, fair value | 254,172,000 | 264,702,000
Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 1,635,000 | 15,961,000
Interest Rate Swaps, Net Amount | 20,147,000 | 2,239,000
Fair Value, Recurring [Member] | Junior Subordinated Debentures [Member] |  |
Liabilities, Fair Value | 43,414,000 | 41,849,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total assets | 12,042,000 | 11,586,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale, fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Securities [Member] |  |
Securities available for sale, fair value | 12,042,000 | 11,586,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 0 | 0
Interest Rate Swaps, Net Amount | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Junior Subordinated Debentures [Member] |  |
Liabilities, Fair Value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total assets | 796,943,000 | 825,774,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 20,147,000 | 2,239,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale, fair value | 554,481,000 | 557,953,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Securities [Member] |  |
Securities available for sale, fair value | 240,827,000 | 251,860,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 1,635,000 | 15,961,000
Interest Rate Swaps, Net Amount | 20,147,000 | 2,239,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Junior Subordinated Debentures [Member] |  |
Liabilities, Fair Value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total assets | 1,303,000 | 1,256,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 43,414,000 | 41,849,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale, fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Securities [Member] |  |
Securities available for sale, fair value | 1,303,000 | 1,256,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] |  |
Interest Rate Swaps, Net Amount | 0 | 0
Interest Rate Swaps, Net Amount | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Junior Subordinated Debentures [Member] |  |
Liabilities, Fair Value | $ 43,414,000 | $ 41,849,000

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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