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Parent Company Only Condensed Financial Information - Condensed Parent Company Only Statements of Cash Flows (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 01, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  | $ 6,305,000 | $ 9,782,000 | $ 9,660,000 | $ 10,473,000 | $ 6,261,000 | $ 4,807,000 | $ 4,626,000 | $ 5,006,000 | $ 36,220,000 | $ 20,700,000 | $ 29,133,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Net accretion of securities |  |  |  |  |  |  |  |  |  |  | 638,000 | 2,285,000 | 590,000
Amortization of junior subordinated debentures |  |  |  |  |  |  |  |  |  |  | 413,000 | 325,000 | 264,000
Amortization of subordinated notes issuance costs |  |  |  |  |  |  |  |  |  |  | 94,000 | 23,000 |
Loss on intercompany sale of loans |  |  |  |  |  |  |  |  |  |  |  | 794,000 |
Loss on sale of loans |  |  |  |  |  |  |  |  |  |  | 80,000 | (154,000) |
Income from CLO warehouse investments |  |  |  |  |  |  |  |  |  |  | (2,226,000) | (3,184,000) | (1,151,000)
(Increase) decrease in other assets |  |  |  |  |  |  |  |  |  |  | 1,515,000 | 1,197,000 | 1,075,000
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  |  | 47,273,000 | 30,983,000 | 25,296,000
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of securities held to maturity |  |  |  |  |  |  |  |  |  |  | (5,092,000) | (29,117,000) |
Proceeds from maturities, calls, and pay downs of securities held to maturity |  |  |  |  |  |  |  |  |  |  | 28,216,000 | 136,000 |
Purchases of loans (shared national credits) |  |  |  |  |  |  |  |  |  |  |  | (995,000) | (28,619,000)
Proceeds from sale of loans |  |  |  |  |  |  |  |  |  |  | 3,834,000 | 24,538,000 |
Net change in loans |  |  |  |  |  |  |  |  |  |  | (586,120,000) | (295,315,000) | (252,390,000)
Net cash paid for CLO warehouse investments |  |  |  |  |  |  |  |  |  |  | (10,000,000) | (25,000,000) | (20,500,000)
Net proceeds from CLO warehouse investments |  |  |  |  |  |  |  |  |  |  | 30,000,000 | 25,500,000 | 2,450,000
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  |  | (379,771,000) | (273,556,000) | (389,133,000)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of subordinated notes, net |  |  |  |  |  |  |  |  |  |  |  | 48,676,000 |
Issuance of common stock, net of expenses |  | $ 65,509,000 |  |  |  |  |  |  |  |  | 65,509,000 |  |
Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  | (774,000) | (887,000) | (780,000)
Purchase of treasury stock |  |  |  |  |  |  |  |  |  |  | (366,000) | (654,000) | (343,000)
Stock option exercises |  |  |  |  |  |  |  |  |  |  | 283,000 |  |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  |  | 352,113,000 | 251,810,000 | 308,226,000
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | 19,615,000 | 9,237,000 | (55,611,000)
Cash and cash equivalents at beginning of period |  |  |  |  |  | 114,514,000 |  |  |  | 105,277,000 | 114,514,000 | 105,277,000 | 160,888,000
Cash and cash equivalents at end of period |  |  | 134,129,000 |  |  |  | 114,514,000 |  |  |  | 134,129,000 | 114,514,000 | 105,277,000
TARP Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of TARP preferred stock |  |  |  |  |  |  |  |  |  |  |  | (10,500,000) |
Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 36,892,000 | 20,028,000 | 29,133,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed subsidiary income |  |  |  |  |  |  |  |  |  |  | (30,347,000) | (22,308,000) | (32,846,000)
Net accretion of securities |  |  |  |  |  |  |  |  |  |  | (800,000) | (174,000) |
Amortization of junior subordinated debentures |  |  |  |  |  |  |  |  |  |  | 413,000 | 325,000 | 67,000
Amortization of subordinated notes issuance costs |  |  |  |  |  |  |  |  |  |  | 94,000 | 23,000 |
Loss on intercompany sale of loans | [1] |  |  |  |  |  |  |  |  |  |  | 794,000 |
Loss on sale of loans |  |  |  |  |  |  |  |  |  |  |  | 80,000 |
Income from CLO warehouse investments |  |  |  |  |  |  |  |  |  |  | (2,226,000) | (3,184,000) | (1,151,000)
(Increase) decrease in other assets |  |  |  |  |  |  |  |  |  |  | 6,689,000 | 3,293,000 | 980,000
Change in accrued expenses and other liabilities |  |  |  |  |  |  |  |  |  |  | 2,950,000 | (5,279,000) | 10,316,000
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  |  | 13,665,000 | (6,402,000) | 6,499,000
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in subsidiaries |  |  |  |  |  |  |  |  |  |  | (6,199,000) | 14,295,000 | 325,000
Purchases of securities held to maturity |  |  |  |  |  |  |  |  |  |  | (5,092,000) | (3,342,000) |
Proceeds from maturities, calls, and pay downs of securities held to maturity |  |  |  |  |  |  |  |  |  |  | 715,000 | 136,000 |
Purchases of loans (shared national credits) |  |  |  |  |  |  |  |  |  |  |  |  | (18,601,000)
Proceeds from sale of loans |  |  |  |  |  |  |  |  |  |  |  | 16,058,000 |
Net change in loans |  |  |  |  |  |  |  |  |  |  | (10,062,000) | 539,000 | 146,000
Net cash paid for CLO warehouse investments |  |  |  |  |  |  |  |  |  |  | (10,000,000) | (25,000,000) | (20,500,000)
Net proceeds from CLO warehouse investments |  |  |  |  |  |  |  |  |  |  | 30,000,000 | 25,500,000 | 2,450,000
Cash used in acquisition of subsidiaries, net |  |  |  |  |  |  |  |  |  |  | (40,075,000) | (69,946,000) |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  |  | (40,713,000) | (41,760,000) | (36,180,000)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of subordinated notes, net |  |  |  |  |  |  |  |  |  |  |  | 48,676,000 |
Issuance of common stock, net of expenses |  |  |  |  |  |  |  |  |  |  | 65,509,000 |  |
Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  | (774,000) | (887,000) | (780,000)
Purchase of treasury stock |  |  |  |  |  |  |  |  |  |  | (366,000) | (654,000) | (343,000)
Stock option exercises |  |  |  |  |  |  |  |  |  |  | 283,000 |  |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  |  | 64,652,000 | 36,635,000 | (1,123,000)
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | 37,604,000 | (11,527,000) | (30,804,000)
Cash and cash equivalents at beginning of period |  |  |  |  |  | $ 10,222,000 |  |  |  | $ 21,749,000 | 10,222,000 | 21,749,000 | 52,553,000
Cash and cash equivalents at end of period |  |  | $ 47,826,000 |  |  |  | $ 10,222,000 |  |  |  | $ 47,826,000 | 10,222,000 | $ 21,749,000
Parent Company | TARP Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of TARP preferred stock |  |  |  |  |  |  |  |  |  |  |  | $ (10,500,000) |
[1] | During the year ended December 31, 2016, a loss was recorded by the parent company as the result of an intercompany sale of loans to its subsidiary, TBK Bank, at the loans’ fair value. The discount on the purchase of the loans recorded by TBK Bank was fully amortized during the year ended December 31, 2017. The parent company loss on sale of the loans and the TBK Bank discount were eliminated in consolidation. The following table presents a reconciliation of parent company stockholders’ equity to consolidated stockholders’ equity at for the year ended December 31, 2016: Year Ended December 31, (Dollars in thousands) 2016 Parent company stockholders' equity $288,673 Parent company loss on intercompany sale of loans 794 TBK Bank discount accretion (122) Consolidated stockholders' equity $289,345

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances which are not originated or purchased specifically for resale. Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow through purchase of long-term held-to-maturity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with purchasing loans held for investment purposes during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow to acquire investments classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the maturity (principal being due), prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Cash inflows (outflows) from issuing and redeeming redeemable preferred stock; includes convertible and nonconvertible redeemable preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash inflow from Sales of Loans Held For Investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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