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Loans - Summary of Allowance for Loan Losses by Portfolio Class and Category (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019
Allowance for Loan Losses [Roll Forward] |  |  |
Balance at December 31, 2018 |  |  | $ 43,476
Balance | $ 44,555 |  |
Portfolio loans, net |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance at December 31, 2018 | 42,935 | $ 41,945 | 42,295
Provision (provision reversal) for loan losses | 1,833 | 1,960 | 1,476
Losses charged off | (1,658) | (1,890) | (2,250)
Recoveries | 588 | 920 | 424
Balance | 43,698 | 42,935 | 41,945
Portfolio loans, net | Commercial and industrial |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance at December 31, 2018 | 29,093 | 28,660 | 29,039
Provision (provision reversal) for loan losses | 867 | 1,781 | 1,445
Losses charged off | (1,295) | (1,380) | (1,853)
Recoveries | 209 | 32 | 29
Balance | 28,874 | 29,093 | 28,660
Portfolio loans, net | CRE - investor owned |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance at December 31, 2018 | 5,324 | 5,339 | 4,683
Provision (provision reversal) for loan losses | 333 | 364 | 769
Losses charged off | 0 | (431) | (120)
Recoveries | 11 | 52 | 7
Balance | 5,668 | 5,324 | 5,339
Portfolio loans, net | CRE - owner occupied |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance at December 31, 2018 | 4,371 | 3,774 | 4,239
Provision (provision reversal) for loan losses | 419 | 591 | (431)
Losses charged off | (22) | 0 | (36)
Recoveries | 3 | 6 | 2
Balance | 4,771 | 4,371 | 3,774
Portfolio loans, net | Construction and land development |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance at December 31, 2018 | 1,972 | 1,699 | 1,987
Provision (provision reversal) for loan losses | (88) | (216) | (252)
Losses charged off | 0 | 0 | (45)
Recoveries | 260 | 489 | 9
Balance | 2,144 | 1,972 | 1,699
Portfolio loans, net | Residential real estate |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance at December 31, 2018 | 1,378 | 1,625 | 1,616
Provision (provision reversal) for loan losses | 193 | (345) | (288)
Losses charged off | (255) | (26) | (67)
Recoveries | 65 | 124 | 364
Balance | 1,381 | 1,378 | 1,625
Portfolio loans, net | Consumer and other |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |
Balance at December 31, 2018 | 797 | 848 | 731
Provision (provision reversal) for loan losses | 109 | (215) | 233
Losses charged off | (86) | (53) | (129)
Recoveries | 40 | 217 | 13
Balance | $ 860 | $ 797 | $ 848

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