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Note 5 - Loans - Allowance for Loan Losses by Portfolio Segment and Based on Impairment Method (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Loans individually evaluated for impairment, allowance | $ 2,134 | $ 2,796
Loans individually evaluated for impairment, balance | 117,353 | 115,074
Loans collectively evaluated for impairment, allowance | 121,145 | 116,170
Loans collectively evaluated for impairment, balance | 12,752,937 | 11,086,201
Loans, allowance | 123,279 | 118,966
Loans | 12,870,290 | 11,201,275
Commercial Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 43 | 1,827
Loans individually evaluated for impairment, balance | 43,495 | 27,761
Loans collectively evaluated for impairment, allowance | 49,753 | 47,376
Loans collectively evaluated for impairment, balance | 2,417,771 | 2,220,426
Loans, allowance | 49,796 | 49,203
Loans | 2,461,266 | 2,248,187
Real Estate Construction Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance |  |
Loans individually evaluated for impairment, balance | 8,185 | 5,458
Loans collectively evaluated for impairment, allowance | 24,838 | 23,268
Loans collectively evaluated for impairment, balance | 670,620 | 542,630
Loans, allowance | 24,838 | 23,268
Loans | 678,805 | 548,088
Commercial Real Estate Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 1,738 | 573
Loans individually evaluated for impairment, balance | 52,664 | 64,470
Loans collectively evaluated for impairment, allowance | 35,872 | 34,291
Loans collectively evaluated for impairment, balance | 6,430,031 | 5,720,778
Loans, allowance | 37,610 | 34,864
Loans | 6,482,695 | 5,785,248
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 353 | 396
Loans individually evaluated for impairment, balance | 13,009 | 17,385
Loans collectively evaluated for impairment, allowance | 10,660 | 11,224
Loans collectively evaluated for impairment, balance | 3,229,345 | 2,598,374
Loans, allowance | 11,013 | 11,620
Loans | 3,242,354 | 2,615,759
Consumer Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance |  |
Loans individually evaluated for impairment, balance |  |
Loans collectively evaluated for impairment, allowance | 22 | 11
Loans collectively evaluated for impairment, balance | 5,170 | 3,993
Loans, allowance | 22 | 11
Loans | $ 5,170 | $ 3,993

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively 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 (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible 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 (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively 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=84173941&loc=SL6953423-111524 + 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=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + 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 (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 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 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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