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Securities (Tables) | 6 Months Ended
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Jun. 30, 2016
Gain (Loss) on Investments [Line Items] |
Reconciliation of fair value of securities | The following table presents a summary of the amortized cost and gross unrealized holding gains and losses recorded in other comprehensive income and fair value of securities available for sale and securities held to maturity for the periods below:
| June 30, 2016 |  | December 31, 2015
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
| (Dollars in thousands)
Available for sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency securities | $ | 26,988 |  |  | $ | 953 |  |  | $ | — |  |  | $ | 27,941 |  |  | $ | 29,958 |  |  | $ | 261 |  |  | $ | (4 | ) |  | $ | 30,215 |
Agency mortgage-backed securities | 186,221 |  |  | 8,230 |  |  | (3 | ) |  | 194,448 |  |  | 207,693 |  |  | 4,227 |  |  | (983 | ) |  | 210,937 |
Agency collateralized mortgage obligations | 102,381 |  |  | 1,712 |  |  | (123 | ) |  | 103,970 |  |  | 64,157 |  |  | 179 |  |  | (752 | ) |  | 63,584 |
State, county, and municipal securities | 4,267 |  |  | 129 |  |  | — |  |  | 4,396 |  |  | 4,543 |  |  | 116 |  |  | — |  |  | 4,659 |
Single issuer trust preferred securities issued by banks | 2,337 |  |  | 5 |  |  | (78 | ) |  | 2,264 |  |  | 2,865 |  |  | 8 |  |  | (81 | ) |  | 2,792 |
Pooled trust preferred securities issued by banks and insurers | 2,209 |  |  | — |  |  | (703 | ) |  | 1,506 |  |  | 2,217 |  |  | — |  |  | (645 | ) |  | 1,572 |
Small business administration pooled securities | 39,252 |  |  | 1,212 |  |  | — |  |  | 40,464 |  |  | 40,472 |  |  | 87 |  |  | (110 | ) |  | 40,449 |
Equity securities | 14,367 |  |  | 755 |  |  | (287 | ) |  | 14,835 |  |  | 13,235 |  |  | 374 |  |  | (568 | ) |  | 13,041 |
Total available for sale securities | $ | 378,022 |  |  | $ | 12,996 |  |  | $ | (1,194 | ) |  | $ | 389,824 |  |  | $ | 365,140 |  |  | $ | 5,252 |  |  | $ | (3,143 | ) |  | $ | 367,249 |
Held to maturity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities | $ | 1,008 |  |  | $ | 92 |  |  | $ | — |  |  | $ | 1,100 |  |  | $ | 1,009 |  |  | $ | 55 |  |  | $ | — |  |  | $ | 1,064 |
Agency mortgage-backed securities | 155,468 |  |  | 6,974 |  |  | — |  |  | 162,442 |  |  | 167,134 |  |  | 3,460 |  |  | (219 | ) |  | 170,375 |
Agency collateralized mortgage obligations | 247,313 |  |  | 5,316 |  |  | (446 | ) |  | 252,183 |  |  | 267,348 |  |  | 1,195 |  |  | (3,652 | ) |  | 264,891 |
State, county, and municipal securities | — |  |  | — |  |  | — |  |  | — |  |  | 225 |  |  | 2 |  |  | — |  |  | 227 |
Single issuer trust preferred securities issued by banks | 1,500 |  |  | 46 |  |  | — |  |  | 1,546 |  |  | 1,500 |  |  | 22 |  |  | — |  |  | 1,522 |
Small business administration pooled securities | 33,367 |  |  | 1,282 |  |  | — |  |  | 34,649 |  |  | 35,291 |  |  | 437 |  |  | (64 | ) |  | 35,664 |
Corporate debt securities | — |  |  | — |  |  | — |  |  | — |  |  | 5,000 |  |  | 6 |  |  | — |  |  | 5,006 |
Total held to maturity securities | $ | 438,656 |  |  | $ | 13,710 |  |  | $ | (446 | ) |  | $ | 451,920 |  |  | $ | 477,507 |  |  | $ | 5,177 |  |  | $ | (3,935 | ) |  | $ | 478,749 |
Total | $ | 816,678 |  |  | $ | 26,706 |  |  | $ | (1,640 | ) |  | $ | 841,744 |  |  | $ | 842,647 |  |  | $ | 10,429 |  |  | $ | (7,078 | ) |  | $ | 845,998 |
Schedule of contractual maturities of securities | A schedule of the contractual maturities of securities available for sale and securities held to maturity as of June 30, 2016 is presented below:
| Available for Sale |  | Held to Maturity
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
| (Dollars in thousands)
Due in one year or less | $ | — |  |  | $ | — |  |  | $ | 32 |  |  | $ | 32 |
Due after one year to five years | 24,601 |  |  | 25,143 |  |  | 16,186 |  |  | 16,973 |
Due after five to ten years | 96,138 |  |  | 99,926 |  |  | 26,469 |  |  | 27,595 |
Due after ten years | 242,916 |  |  | 249,920 |  |  | 395,969 |  |  | 407,320 |
Total debt securities | $ | 363,655 |  |  | $ | 374,989 |  |  | $ | 438,656 |  |  | $ | 451,920 |
Equity securities | $ | 14,367 |  |  | $ | 14,835 |  |  | $ | — |  |  | $ | — |
Total | $ | 378,022 |  |  | $ | 389,824 |  |  | $ | 438,656 |  |  | $ | 451,920 |
Schedule of gross unrealized losses and fair value of investments |
| June 30, 2016
|  |  | Less than 12 months |  | 12 months or longer |  | Total
| # of holdings |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
| (Dollars in thousands)
Agency mortgage-backed securities | 1 |  |  | $ | 434 |  |  | $ | (3 | ) |  | $ | — |  |  | $ | — |  |  | $ | 434 |  |  | $ | (3 | )
Agency collateralized mortgage obligations | 7 |  |  | — |  |  | — |  |  | 54,467 |  |  | (569 | ) |  | 54,467 |  |  | (569 | )
Single issuer trust preferred securities issued by banks and insurers | 2 |  |  | — |  |  | — |  |  | 2,014 |  |  | (78 | ) |  | 2,014 |  |  | (78 | )
Pooled trust preferred securities issued by banks and insurers | 1 |  |  | — |  |  | — |  |  | 1,506 |  |  | (703 | ) |  | 1,506 |  |  | (703 | )
Equity securities | 25 |  |  | 408 |  |  | (22 | ) |  | 6,391 |  |  | (265 | ) |  | 6,799 |  |  | (287 | )
Total temporarily impaired securities | 36 |  |  | $ | 842 |  |  | $ | (25 | ) |  | $ | 64,378 |  |  | $ | (1,615 | ) |  | $ | 65,220 |  |  | $ | (1,640 | )
| December 31, 2015
|  |  | Less than 12 months |  | 12 months or longer |  | Total
| # of holdings |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
| (Dollars in thousands)
U.S.government agency securities | 3 |  |  | $ | 1,990 |  |  | $ | (4 | ) |  | $ | — |  |  | $ | — |  |  | $ | 1,990 |  |  | $ | (4 | )
Agency mortgage-backed securities | 57 |  |  | 112,648 |  |  | (1,062 | ) |  | 4,297 |  |  | (140 | ) |  | 116,945 |  |  | (1,202 | )
Agency collateralized mortgage obligations | 23 |  |  | 147,707 |  |  | (1,420 | ) |  | 80,927 |  |  | (2,984 | ) |  | 228,634 |  |  | (4,404 | )
Single issuer trust preferred securities issued by banks and insurers | 2 |  |  | 1,018 |  |  | (33 | ) |  | 1,018 |  |  | (48 | ) |  | 2,036 |  |  | (81 | )
Pooled trust preferred securities issued by banks and insurers | 1 |  |  | — |  |  | — |  |  | 1,572 |  |  | (645 | ) |  | 1,572 |  |  | (645 | )
Small business administration pooled securities | 3 |  |  | 37,986 |  |  | (174 | ) |  | — |  |  | — |  |  | 37,986 |  |  | (174 | )
Equity securities | 34 |  |  | 3,481 |  |  | (189 | ) |  | 4,971 |  |  | (379 | ) |  | 8,452 |  |  | (568 | )
Total temporarily impaired securities | 123 |  |  | $ | 304,830 |  |  | $ | (2,882 | ) |  | $ | 92,785 |  |  | $ | (4,196 | ) |  | $ | 397,615 |  |  | $ | (7,078 | )
Schedule of Other Than Temporary Impairment [Table Text Block] | The following table shows the total OTTI that the Company recorded for the periods indicated:
| Three Months Ended |  | Six Months Ended
| June 30 |  | June 30
| 2016 |  | 2015 |  | 2016 |  | 2015
| (Dollars in thousands)
Gross change in OTTI recorded on certain investments | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 84 |
Portion of OTTI recognized in OCI | — |  |  | — |  |  | — |  |  | (84 | )
Total credit related OTTI recognized in earnings | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Summary of cumulative credit related component of OTTI | The following table shows the cumulative credit related component of OTTI for the periods indicated:
| Three Months Ended |  | Six Months Ended
| June 30 |  | June 30
| 2016 |  | 2015 |  | 2016 |  | 2015
| (Dollars in thousands)
Balance at beginning of period | $ | — |  |  | $ | (9,997 | ) |  | $ | — |  |  | $ | (9,997 | )
Add |  |  |  |  |  |  |
Incurred on securities not previously impaired | — |  |  | — |  |  | — |  |  | — |
Incurred on securities previously impaired | — |  |  | — |  |  | — |  |  | — |
Less |  |  |  |  |  |  |
Securities sold during the period | — |  |  | 9,997 |  |  | — |  |  | 9,997 |
Reclassification due to changes in Company's intent | — |  |  | — |  |  | — |  |  | — |
Increases in cash flow expected to be collected | — |  |  | — |  |  | — |  |  | — |
Balance at end of period | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |

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