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Securities (Tables) | 6 Months Ended
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Jun. 30, 2018
Securities [Abstract] |
Amortized Cost and Fair Value of Available-for-sale Securities | The amortized cost and fair value of securities at June 30, 2018 are summarized as follows: Available-for-Sale
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Treasury and government agencies |  | $ | 249,625 |  |  | $ | 29 |  |  | $ | (2,881 | ) |  | $ | 246,773 |
State and political subdivisions |  |  | 129,628 |  |  |  | 875 |  |  |  | (3,014 | ) |  |  | 127,489 |
U.S. government sponsored agency mortgage-backed securities |  |  | 217,260 |  |  |  | 194 |  |  |  | (6,454 | ) |  |  | 211,000 |
Other debt securities |  |  | 507 |  |  |  | 0 |  |  |  | (5 | ) |  |  | 502 |
Total debt securities |  |  | 597,020 |  |  |  | 1,098 |  |  |  | (12,354 | ) |  |  | 585,764 |
CRA investment funds |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Total available-for-sale securities |  | $ | 597,020 |  |  | $ | 1,098 |  |  | $ | (12,354 | ) |  | $ | 585,764 |
The amortized cost and fair value of securities at December 31, 2017 are summarized as follows: Available-for-Sale
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Treasury and government agencies |  | $ | 211,574 |  |  | $ | 170 |  |  | $ | (1,172 | ) |  | $ | 210,572 |
State and political subdivisions |  |  | 144,159 |  |  |  | 2,017 |  |  |  | (1,161 | ) |  |  | 145,015 |
U.S. government sponsored agency mortgage-backed securities |  |  | 208,959 |  |  |  | 357 |  |  |  | (4,007 | ) |  |  | 205,309 |
Other debt securities |  |  | 507 |  |  |  | 0 |  |  |  | 0 |  |  |  | 507 |
Total debt securities |  |  | 565,199 |  |  |  | 2,544 |  |  |  | (6,340 | ) |  |  | 561,403 |
CRA investment funds |  |  | 25,000 |  |  |  | 76 |  |  |  | (718 | ) |  |  | 24,358 |
Total available-for-sale securities |  | $ | 590,199 |  |  | $ | 2,620 |  |  | $ | (7,058 | ) |  | $ | 585,761 |
Amortized Cost and Fair Value of Held-to-maturity Securities | The amortized cost and fair value of securities at June 30, 2018 are summarized as follows: Held-to-Maturity
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
State and political subdivisions |  | $ | 659 |  |  | $ | 1 |  |  | $ | 0 |  |  | $ | 660 |
Total held-to-maturity securities |  | $ | 659 |  |  | $ | 1 |  |  | $ | 0 |  |  | $ | 660 |
The amortized cost and fair value of securities at December 31, 2017 are summarized as follows: Held-to-Maturity
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
State and political subdivisions |  | $ | 659 |  |  | $ | 1 |  |  | $ | 0 |  |  | $ | 660 |
Total held-to-maturity securities |  | $ | 659 |  |  | $ | 1 |  |  | $ | 0 |  |  | $ | 660 |
Amortized Cost and Fair Value of Securities by Contractual Maturity | The amortized cost and fair value of securities at June 30, 2018 by contractual maturity are shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
|  | Available-for-Sale |  |  | Held-to-Maturity |
(in thousands) |  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 45,792 |  |  | $ | 45,586 |  |  | $ | 0 |  |  | $ | 0 |
Due after one through five years |  |  | 133,474 |  |  |  | 131,738 |  |  |  | 659 |  |  |  | 660 |
Due after five through ten years |  |  | 66,356 |  |  |  | 65,169 |  |  |  | 0 |  |  |  | 0 |
Due after ten years |  |  | 133,631 |  |  |  | 131,769 |  |  |  | 0 |  |  |  | 0 |
U.S. government sponsored agency mortgage-backed securities |  |  | 217,260 |  |  |  | 211,000 |  |  |  | 0 |  |  |  | 0 |
Other debt securities |  |  | 507 |  |  |  | 502 |  |  |  | 0 |  |  |  | 0 |
Total securities |  | $ | 597,020 |  |  | $ | 585,764 |  |  | $ | 659 |  |  | $ | 660 |
Available for Sale Securities and Held-to-Maturity Securities, Continuous Unrealized Loss Position | The following tables provide the amortized cost, gross unrealized losses, and fair market value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position as of June 30, 2018 that are not deemed to be other-than-temporarily impaired. There were no held-to-maturity securities that were deemed to be impaired as of June 30, 2018. Available-for-Sale
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |
Less Than 12 Months |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  | $ | 170,250 |  |  | $ | (2,091 | ) |  | $ | 168,159 |
State and political subdivisions |  |  | 55,441 |  |  |  | (1,492 | ) |  |  | 53,949 |
U.S. government sponsored agency mortgage-backed securities |  |  | 73,073 |  |  |  | (1,599 | ) |  |  | 71,474 |
Other debt securities |  |  | 507 |  |  |  | (5 | ) |  |  | 502 |
Total <12 months temporarily impaired AFS securities |  |  | 299,271 |  |  |  | (5,187 | ) |  |  | 294,084 |
12 Months or More |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  |  | 44,226 |  |  |  | (790 | ) |  |  | 43,436 |
State and political subdivisions |  |  | 18,219 |  |  |  | (1,522 | ) |  |  | 16,697 |
U.S. government sponsored agency mortgage-backed securities |  |  | 127,030 |  |  |  | (4,855 | ) |  |  | 122,175 |
Other debt securities |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Total ≥12 months temporarily impaired AFS securities |  |  | 189,475 |  |  |  | (7,167 | ) |  |  | 182,308 |
Total |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  |  | 214,476 |  |  |  | (2,881 | ) |  |  | 211,595 |
State and political subdivisions |  |  | 73,660 |  |  |  | (3,014 | ) |  |  | 70,646 |
U.S. government sponsored agency mortgage-backed securities |  |  | 200,103 |  |  |  | (6,454 | ) |  |  | 193,649 |
Other debt securities |  |  | 507 |  |  |  | (5 | ) |  |  | 502 |
Total temporarily impaired AFS securities |  | $ | 488,746 |  |  | $ | (12,354 | ) |  | $ | 476,392 |
The following tables provide the amortized cost, gross unrealized losses, and fair market value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position as of December 31, 2017 that are not deemed to be other-than-temporarily impaired. There were no held-to-maturity securities that were deemed to be impaired as of December 31, 2017. Available-for-Sale
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |
Less Than 12 Months |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  | $ | 136,688 |  |  | $ | (840 | ) |  | $ | 135,848 |
State and political subdivisions |  |  | 34,283 |  |  |  | (416 | ) |  |  | 33,867 |
U.S. government sponsored agency mortgage-backed securities |  |  | 62,768 |  |  |  | (643 | ) |  |  | 62,125 |
Total debt securities |  |  | 233,739 |  |  |  | (1,899 | ) |  |  | 231,840 |
CRA investment funds |  |  | 7,500 |  |  |  | (105 | ) |  |  | 7,395 |
Total <12 months temporarily impaired AFS securities |  |  | 241,239 |  |  |  | (2,004 | ) |  |  | 239,235 |
12 Months or More |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  |  | 23,885 |  |  |  | (332 | ) |  |  | 23,553 |
State and political subdivisions |  |  | 16,930 |  |  |  | (745 | ) |  |  | 16,185 |
U.S. government sponsored agency mortgage-backed securities |  |  | 117,827 |  |  |  | (3,364 | ) |  |  | 114,463 |
Total debt securities |  |  | 158,642 |  |  |  | (4,441 | ) |  |  | 154,201 |
CRA investment funds |  |  | 15,000 |  |  |  | (613 | ) |  |  | 14,387 |
Total ≥12 months temporarily impaired AFS securities |  |  | 173,642 |  |  |  | (5,054 | ) |  |  | 168,588 |
Total |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  |  | 160,573 |  |  |  | (1,172 | ) |  |  | 159,401 |
State and political subdivisions |  |  | 51,213 |  |  |  | (1,161 | ) |  |  | 50,052 |
U.S. government sponsored agency mortgage-backed securities |  |  | 180,595 |  |  |  | (4,007 | ) |  |  | 176,588 |
Total debt securities |  |  | 392,381 |  |  |  | (6,340 | ) |  |  | 386,041 |
CRA investment funds |  |  | 22,500 |  |  |  | (718 | ) |  |  | 21,782 |
Total temporarily impaired AFS securities |  | $ | 414,881 |  |  | $ | (7,058 | ) |  | $ | 407,823 |

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