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Note 21 - Parent Company Only Financial Statements - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 12, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net income |  | $ 15,891 | $ 15,095 | $ 13,504 | $ 12,918 | $ 13,316 | $ 8,809 | $ 10,445 | $ 10,550 | $ 57,408 | $ 43,120 | $ 35,707
Accretion of acquisition fair value adjustments, net |  |  |  |  |  |  |  |  |  | (4,344) | (5,527) | (4,941)
Depreciation |  |  |  |  |  |  |  |  |  | 5,225 | 4,451 | 3,949
Stock-based compensation expense |  |  |  |  |  |  |  |  |  | 2,469 | 1,443 | 1,187
Securities gains, net |  |  |  |  |  |  |  |  |  | 30 |  | 88
Goodwill impairment |  |  |  |  |  |  |  |  |  | 3,000 |  |
Gains on debt extinguishment |  |  |  | $ 50 |  |  |  |  |  | 436 |  |
Net decrease (increase) in interest-bearing deposits at financial institutions |  |  |  |  |  |  |  |  |  | (69,984) | (14,508) | 12,138
Purchases |  |  |  |  |  |  |  |  |  | (71,963) | (84,045) | (179,786)
Calls, maturities and redemptions |  |  |  |  |  |  |  |  |  | 25,193 | 23,931 | 43,010
Sales |  |  |  |  |  |  |  |  |  | 30,055 | 1,938 | 71,092
Net cash paid for acquisition |  |  |  |  |  |  |  |  |  |  | (5,183) | (3,369)
Purchase of premises and equipment |  |  |  |  |  |  |  |  |  | (12,429) | (11,457) | (5,761)
Net cash (used in) investing activities |  |  |  |  |  |  |  |  |  | (308,664) | (333,648) | (410,517)
Proceeds from other borrowings |  |  |  |  |  |  |  |  |  |  | 9,000 | 7,000
Paydown of revolving line of credit |  |  |  |  |  |  |  |  |  | 9,000 |  |
Prepayments |  |  |  |  |  |  |  |  |  | (46,313) |  |
Calls, maturities and scheduled principal payments |  |  |  |  |  |  |  |  |  | (11,937) | (12,550) | (21,000)
Proceeds from subordinated notes | $ 63,400 |  |  |  |  |  |  |  |  | 63,393 |  |
Proceeds from issuance of common stock, net |  |  |  |  |  |  |  |  |  | 1,926 | 1,279 | 2,056
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  | 222,901 | 279,178 | 381,956
Net increase (decrease) in cash and due from banks |  |  |  |  |  |  |  |  |  | (9,269) | 9,801 | 5,152
Parent Company [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 57,408 | 43,120 | 35,707
Accretion of acquisition fair value adjustments, net |  |  |  |  |  |  |  |  |  | 305 | 183 | 149
Depreciation |  |  |  |  |  |  |  |  |  | 327 | 249 | 225
Stock-based compensation expense |  |  |  |  |  |  |  |  |  | 2,469 | 1,443 | 1,187
Securities gains, net |  |  |  |  |  |  |  |  |  |  |  | (6)
Goodwill impairment |  |  |  |  |  |  |  |  |  | 3,000 |  |
Decrease (increase) in other assets |  |  |  |  |  |  |  |  |  | 26 | 2,232 | (969)
(Decrease) increase in other liabilities |  |  |  |  |  |  |  |  |  | 7,814 | (7,226) | (6,919)
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 39,644 | 19,791 | 5,234
Net decrease (increase) in interest-bearing deposits at financial institutions |  |  |  |  |  |  |  |  |  | (4,600) | (1,000) |
Calls, maturities and redemptions |  |  |  |  |  |  |  |  |  |  |  | (6)
Sales |  |  |  |  |  |  |  |  |  |  |  | 32
Net cash paid for acquisition |  |  |  |  |  |  |  |  |  |  | (5,183) | (3,369)
Purchase of premises and equipment |  |  |  |  |  |  |  |  |  | (2,861) | (2,257) | (69)
Net cash (used in) investing activities |  |  |  |  |  |  |  |  |  | 16,161 | 11,940 | 3,400
Proceeds from other borrowings |  |  |  |  |  |  |  |  |  |  | 9,000 | 7,000
Paydown of revolving line of credit |  |  |  |  |  |  |  |  |  | (9,000) |  |
Prepayments |  |  |  |  |  |  |  |  |  | (21,313) |  |
Calls, maturities and scheduled principal payments |  |  |  |  |  |  |  |  |  | (1,799) | (12,550) | (11,000)
Proceeds from subordinated notes |  |  |  |  |  |  |  |  |  | 63,393 |  |
Payment of cash dividends on common and preferred stock |  |  |  |  |  |  |  |  |  | (3,767) | (3,300) | (2,494)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  | 29,440 | (5,571) | (4,438)
Net increase (decrease) in cash and due from banks |  |  |  |  |  |  |  |  |  | 52,923 | 2,280 | (2,604)
Cash and due from banks, beginning |  |  |  |  | $ 6,606 |  |  |  | $ 4,326 | 6,606 | 4,326 | 6,930
Cash and due from banks, ending |  | $ 59,529 |  |  |  | $ 6,606 |  |  |  | 59,529 | 6,606 | 4,326
Parent Company [Member] | Reportable Legal Entities [Member] | Common Stock Offering 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock, net |  |  |  |  |  |  |  |  |  | 1,926 | 1,279 | 2,056
Parent Company [Member] | Reportable Legal Entities [Member] | Bank Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |
Earnings of bank subsidiaries |  |  |  |  |  |  |  |  |  | (69,966) | (55,209) | (45,104)
Distributions from bank subsidiaries |  |  |  |  |  |  |  |  |  |  | 34,500 | 21,000
Parent Company [Member] | Reportable Legal Entities [Member] | Non-bank Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |
Earnings of bank subsidiaries |  |  |  |  |  |  |  |  |  | (6,797) | 436 | (75)
Distributions from bank subsidiaries |  |  |  |  |  |  |  |  |  | 45,058 | 63 | $ 39
Parent Company [Member] | Reportable Legal Entities [Member] | Bank Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital infusion to subsidiaries |  |  |  |  |  |  |  |  |  | (8,600) | $ (3,500) |
Parent Company [Member] | Reportable Legal Entities [Member] | Non-bank Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital infusion to subsidiaries |  |  |  |  |  |  |  |  |  | $ (100) |  |

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- Definition Amount of cash outflow to acquire 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 + Details
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