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Investments (Tables) | 6 Months Ended
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Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation | The amortized cost and estimated fair value of investment securities available-for-sale are as follows
|  | June 30, 2016 |
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |
US Government agencies |  | $ | 24,466 |  | $ | 409 |  | $ | (3) |  | $ | 24,872 |
Mortgage-backed securities |  |  | 391,345 |  |  | 3,951 |  |  | (682) |  |  | 394,614 |
State and poltical subdivisions |  |  | 103,433 |  |  | 4,503 |  |  | (10) |  |  | 107,926 |
Other securities |  |  | 500 |  |  | 627 |  |  | - |  |  | 1,127 |
Total investment securities |  | $ | 519,744 |  | $ | 9,490 |  | $ | (695) |  | $ | 528,539 |
|  | December 31, 2015 |
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |
US Government agencies |  | $ | 28,801 |  | $ | 303 |  | $ | (62) |  | $ | 29,042 |
Mortgage-backed securities |  |  | 374,683 |  |  | 2,440 |  |  | (2,062) |  |  | 375,061 |
State and political subdivisons |  |  | 99,093 |  |  | 3,146 |  |  | (56) |  |  | 102,183 |
Other securities |  |  | 575 |  |  | 721 |  |  | - |  |  | 1,296 |
Total investment securities |  | $ | 503,152 |  | $ | 6,610 |  | $ | (2,180) |  | $ | 507,582 |
Information Pertaining to Investment Securities Aggregated by Investment Category and Length of Time that Individual Securities in a Continuous Loss Position | Investment Portfolio - Unrealized Losses (dollars in thousands, unaudited)
|  | June 30, 2016 |
|  | Less than twelve months |  | Twelve months or more |
|  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |
US Government agencies |  | $ | (3) |  | $ | 3,301 |  | $ | - |  | $ | - |
Mortgage-backed securities |  |  | (323) |  |  | 67,579 |  |  | (359) |  |  | 51,187 |
State and political subdivisions |  |  | (10) |  |  | 1,583 |  |  | - |  |  | - |
Total |  | $ | (336) |  | $ | 72,463 |  | $ | (359) |  | $ | 51,187 |
|  | December 31, 2015 |
|  | Less than twelve months |  | Twelve months or more |
|  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |
US Government agencies |  | $ | (62) |  | $ | 10,329 |  | $ | - |  | $ | - |
Mortgage-backed securities |  |  | (1,608) |  |  | 187,734 |  |  | (454) |  |  | 35,511 |
State and political subdivisions |  |  | (17) |  |  | 3,409 |  |  | (39) |  |  | 3,847 |
Total |  | $ | (1,687) |  | $ | 201,472 |  | $ | (493) |  | $ | 39,358 |
Realized Gain (Loss) on Investments | Investment Portfolio - Realized Gains/(Losses) (dollars in thousands, unaudited)
|  | Three months ended June 30, |  | Six months ended June 30, |
|  | 2016 |  | 2015 |  | 2016 |  | 2015 |
Proceeds from sales, calls and maturities of securities available for sale |  | $ | 2,790 |  | $ | 2,963 |  | $ | 5,395 |  | $ | 22,828 |
Gross gains on sales, calls and maturities of securities available for sale |  | $ | 146 |  | $ | 307 |  | $ | 160 |  | $ | 522 |
Gross losses on sales, calls and maturities of securities available for sale |  |  | - |  |  | - |  |  | (38) |  |  | (199) |
Net gains on sale of securities available for sale |  | $ | 146 |  | $ | 307 |  | $ | 122 |  | $ | 323 |
Investments Classified by Contractual Maturity Date | Estimated Fair Value of Contractual Maturities (dollars in thousands, unaudited)
|  | June 30, 2016 |
|  | Amortized Cost |  | Fair Value |
Maturing within one year |  | $ | 6,164 |  | $ | 6,370 |
Maturing after one year through five years |  |  | 250,424 |  |  | 253,919 |
Maturing after five years through ten years |  |  | 47,068 |  |  | 48,674 |
Maturing after ten years |  |  | 47,348 |  |  | 49,287 |
Investment securities not due at a single maturity date: |  |  |  |  |  |  |
U.S Government agencies collateralized by mortgage obligations |  |  | 168,240 |  |  | 169,162 |
Other securities |  |  | 500 |  |  | 1,127 |
|  | $ | 519,744 |  | $ | 528,539 |
|  | December 31, 2015 |
|  | Amortized Cost |  | Fair Value |
Maturing within one year |  | $ | 3,657 |  | $ | 3,706 |
Maturing after one year through five years |  |  | 242,719 |  |  | 244,733 |
Maturing after five years through ten years |  |  | 50,144 |  |  | 51,308 |
Maturing after ten years |  |  | 50,413 |  |  | 51,671 |
Investment securities not due at a single maturity date: |  |  |  |  |  |  |
U.S Government agencies collateralized by mortgage obligations |  |  | 155,644 |  |  | 154,868 |
Other securities |  |  | 575 |  |  | 1,296 |
|  | $ | 503,152 |  | $ | 507,582 |
Summary of amortized cost and fair values of general obligation and revenue bonds | Revenue and General Obligation Bonds by Location (dollars in thousands, unaudited)
|  | June 30, 2016 |  | December 31, 2015 |
|  | Amortized |  | Fair Market |  | Amortized |  | Fair Market |
General obligation bonds |  | Cost |  | Value |  | Cost |  | Value |
State of issuance |  |  |  |  |  |  |  |  |  |  |  |  |
California |  | $ | 23,250 |  | $ | 24,690 |  | $ | 20,473 |  | $ | 21,642 |
Texas |  |  | 17,656 |  |  | 18,326 |  |  | 16,575 |  |  | 16,954 |
Illinois |  |  | 10,234 |  |  | 10,545 |  |  | 9,997 |  |  | 10,191 |
Ohio |  |  | 9,059 |  |  | 9,305 |  |  | 7,610 |  |  | 7,748 |
Washington |  |  | 5,873 |  |  | 6,090 |  |  | 5,905 |  |  | 6,081 |
Arizona |  |  | 2,023 |  |  | 2,103 |  |  | 2,039 |  |  | 2,108 |
Utah |  |  | 951 |  |  | 1,013 |  |  | 953 |  |  | 990 |
Other states |  |  | 18,518 |  |  | 19,298 |  |  | 20,334 |  |  | 20,848 |
Total General Obligation Bonds |  |  | 87,564 |  |  | 91,370 |  |  | 83,886 |  |  | 86,562 |
Revenue bonds |  |  |  |  |  |  |  |  |  |  |  |  |
State of issuance |  |  |  |  |  |  |  |  |  |  |  |  |
Texas |  |  | 4,969 |  |  | 5,153 |  |  | 3,732 |  |  | 3,863 |
Utah |  |  | 4,426 |  |  | 4,631 |  |  | 4,434 |  |  | 4,519 |
Washington |  |  | 1,306 |  |  | 1,387 |  |  | 1,791 |  |  | 1,827 |
California |  |  | 1,002 |  |  | 1,030 |  |  | 1,002 |  |  | 1,028 |
Ohio |  |  | 318 |  |  | 319 |  |  | 318 |  |  | 319 |
Other states |  |  | 3,848 |  |  | 4,036 |  |  | 3,930 |  |  | 4,065 |
Total Revenue Bonds |  |  | 15,869 |  |  | 16,556 |  |  | 15,207 |  |  | 15,621 |
Total Obligations of States and Political Subdivisions |  | $ | 103,433 |  | $ | 107,926 |  | $ | 99,093 |  | $ | 102,183 |
|  | June 30, 2016 |  | December 31, 2015 |
|  | Amortized |  | Fair Market |  | Amortized |  | Fair Market |
Revenue bonds |  | Cost |  | Value |  | Cost |  | Value |
Revenue source: |  |  |  |  |  |  |  |  |  |  |  |  |
Water |  | $ | 4,402 |  | $ | 4,516 |  | $ | 3,942 |  | $ | 4,052 |
College & University |  |  | 2,706 |  |  | 2,876 |  |  | 2,975 |  |  | 3,103 |
Sales Tax |  |  | 2,256 |  |  | 2,373 |  |  | 2,630 |  |  | 2,663 |
Lease |  |  | 2,299 |  |  | 2,403 |  |  | 2,040 |  |  | 2,100 |
Port, Airport & Marina |  |  | 1,302 |  |  | 1,374 |  |  | - |  |  | - |
Electric & Power |  |  | 729 |  |  | 753 |  |  | 679 |  |  | 691 |
Other sources |  |  | 2,175 |  |  | 2,261 |  |  | 2,941 |  |  | 3,012 |
Total Revenue Bonds |  | $ | 15,869 |  | $ | 16,556 |  | $ | 15,207 |  | $ | 15,621 |

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