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Note 11 - Other Borrowings and Subordinated Debentures - Long-term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Other borrowings | $ 1,380,024 | $ 273,159
Subordinated debentures | 140,565 | 60,397
Subordinated Debentures | 140,565 | 60,397
Total other borrowings and subordinated debentures | 1,520,589 | 333,556
U.S. Bank National Association [Member] | Revolving Credit Facility [Member] |  |
Revolving credit agreement, due 10/5/2018, floating rate of 1.50% above the one month LIBOR rate, unsecured | 75,000 |
Federal Home Loan Bank Advances [Member] |  |
FHLB advances, net of discount, due 2018 to 2033, 1.20% to 7.37% secured by residential real estate loans | 1,261,642 | 225,230
Note Payable Due 10/15/2020 [Member] |  |
Notes payable, due 10/15/2020, 3.85%, fixed rate, unsecured | 43,382 | 47,929
Trust Preferred Securities Due 12/30/2033 Floating Rate of 2.8% Above Three Month LIBOR 1 [Member] |  |
Subordinated debentures | 20,620 | 20,620
Subordinated Debentures | 20,620 | 20,620
Trust Preferred Securities Due 6/30/2035 [Member] |  |
Subordinated debentures | 9,327 | 9,225
Subordinated Debentures | 9,327 | 9,225
Trust Preferred Securities Due 9/15/2037 [Member] |  |
Subordinated debentures | 10,284 | 10,130
Subordinated Debentures | 10,284 | 10,130
Trust Preferred Securities Due 12/5/2033 [Member] |  |
Subordinated debentures | 5,156 | 5,161
Subordinated Debentures | 5,156 | 5,161
Trust Preferred Securities Due 10/18/2034 [Member] |  |
Subordinated debentures | 5,148 | 5,105
Subordinated Debentures | 5,148 | 5,105
Trust Preferred Securities, Due 6/6/2037 [Member] |  |
Subordinated debentures | 10,288 | 10,156
Subordinated Debentures | 10,288 | 10,156
Trust Preferred Securities, Due 12/15/2035 [Member] |  |
Subordinated debentures | 6,702 |
Subordinated Debentures | 6,702 |
Trust Preferred Securities, Due 6/26/2033 [Member] |  |
Subordinated debentures | 20,619 |
Subordinated Debentures | 20,619 |
Trust Preferred Securities, Due 10/7/2033 [Member] |  |
Subordinated debentures | 25,774 |
Subordinated Debentures | 25,774 |
Second Trust Preferred Securities Due 9/15/2037 [Member] |  |
Subordinated debentures | 8,248 |
Subordinated Debentures | 8,248 |
Trust Preferred Securities, Due 9/30/2023 [Member] |  |
Subordinated debentures | 18,399 |
Subordinated Debentures | $ 18,399 |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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