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Quarterly Financial Data (Unaudited) - Selected Unaudited Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
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
Note 21 - Quarterly Financial Data (Unaudited) - Selected Unaudited Quarterly Financial Data (Details)                      
Interest income $ 70,179 $ 69,389 $ 69,575 $ 69,813 $ 67,433 $ 65,486 $ 63,293 $ 60,786 $ 278,956 $ 256,998 $ 234,585
Interest expense 29,000 30,440 29,566 28,010 26,797 23,965 20,653 18,177 117,016 89,592 61,478
Net interest income 41,179 38,949 40,009 41,803 40,636 41,521 42,640 42,609 161,940 167,406 173,107
Provision (benefit) for loan losses (318) 683 1,474 972 422 0 0 153 2,811 575 9,861
Other operating income (loss) 5,038 1,039 2,451 943 (986) 4,955 3,168 3,200 9,471 10,337 10,362
Other operating expense 29,647 26,045 27,158 32,419 25,760 27,233 27,396 31,294 115,269 111,683 107,474
Income before income tax expense 16,888 13,260 13,828 9,355 13,468 19,243 18,412 14,362 53,331 65,485 66,134
Income tax benefit 3,957 2,536 3,272 2,287 1,046 1,910 4,489 2,950 12,052 10,395 25,013
Net income $ 12,931 $ 10,724 $ 10,556 $ 7,068 $ 12,422 $ 17,333 $ 13,923 $ 11,412 $ 41,279 $ 55,090 $ 41,121
Basic earnings per common share (in dollars per share) $ 0.45 $ 0.37 $ 0.37 $ 0.25 $ 0.44 $ 0.61 $ 0.48 $ 0.39 $ 1.44 $ 1.92 $ 1.41
Diluted earnings per common share (in dollars per share) 0.45 0.37 0.37 0.25 0.44 0.61 0.48 0.39 1.44 1.92 1.41
Dividends on common stock (in dollars per share) $ 0.21 $ 0.21 $ 0.21 $ 0.21 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.84 $ 0.80 $ 0.72
Basic earnings per share (in shares) 28,723 28,730 28,761 28,621 28,422 28,604 28,845 28,974 28,709 28,709 29,080
Diluted earnings per share (in shares) 28,723 28,730 28,761 28,621 28,423 28,604 28,846 28,975 28,709 28,710 29,082