XML 58 R24.htm IDEA: XBRL DOCUMENT
v3.20.1

Investment Securities Available-for-Sale (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2020
Investment Securities Available-for-Sale |
Schedule of amortized cost and estimated fair value of securities available-for-sale | Amortized cost and estimated fair value of securities available-for-sale are summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | Estimated
March 31, 2020 | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value
U. S. agency securities | ​ | $ | 146,948 | ​ | $ | 1,527 | ​ | $ | 716 | ​ | $ | 147,759
Residential mortgage backed securities | ​ |  | 531,784 | ​ |  | 16,110 | ​ |  | 506 | ​ |  | 547,388
Municipal bonds | ​ |  | 72,828 | ​ |  | 2,760 | ​ |  | — | ​ |  | 75,588
Corporate bonds | ​ |  | 52,087 | ​ |  | 969 | ​ |  | 72 | ​ |  | 52,984
U.S. Treasury | ​ | ​ | 34,986 | ​ | ​ | 13 | ​ | ​ | — | ​ | ​ | 34,999
Other equity investments | ​ |  | 198 | ​ |  | — | ​ |  | — | ​ |  | 198
​ | ​ | $ | 838,831 | ​ | $ | 21,379 | ​ | $ | 1,294 | ​ | $ | 858,916
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | Estimated
December 31, 2019 | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value
U. S. agency securities | ​ | $ | 180,228 | ​ | $ | 621 | ​ | $ | 1,055 | ​ | $ | 179,794
Residential mortgage backed securities | ​ |  | 541,490 | ​ |  | 4,337 | ​ |  | 1,975 | ​ |  | 543,852
Municipal bonds | ​ |  | 71,902 | ​ |  | 2,034 | ​ |  | 5 | ​ |  | 73,931
Corporate bonds | ​ |  | 10,530 | ​ |  | 203 | ​ |  | — | ​ |  | 10,733
U.S. Treasury | ​ | ​ | 34,844 | ​ | ​ | 11 | ​ | ​ | — | ​ | ​ | 34,855
Other equity investments | ​ |  | 198 | ​ |  | — | ​ |  | — | ​ |  | 198
​ | ​ | $ | 839,192 | ​ | $ | 7,206 | ​ | $ | 3,035 | ​ | $ | 843,363
​
Schedule of gross unrealized losses and fair value by length of time that the individual available-for-sale securities have been in a continuous unrealized loss | Gross unrealized losses and fair value of available-for-sale securities for which an allowance for credit losses has not been recorded, by length of time that individual securities have been in a continuous unrealized loss position are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Less than | ​ | 12 Months | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | 12 Months | ​ | or Greater | ​ | Total
​ | ​ | ​ | ​ | Estimated | ​ | ​ | ​ | ​ | Estimated | ​ | ​ | ​ | ​ | Estimated | ​ | ​ | ​
March 31, 2020 | ​ | Number of | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
(dollars in thousands) |  | Securities |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
U. S. agency securities |  | 23 | ​ | $ | 13,835 | ​ | $ | 162 | ​ | $ | 39,486 | ​ | $ | 554 | ​ | $ | 53,321 | ​ | $ | 716
Residential mortgage backed securities |  | 11 | ​ |  | 18,321 | ​ |  | 275 | ​ |  | 7,888 | ​ |  | 231 | ​ |  | 26,209 | ​ |  | 506
Corporate bonds |  | 1 | ​ |  | 2,955 | ​ |  | 72 | ​ |  | — | ​ |  | — | ​ |  | 2,955 | ​ |  | 72
​ |  | 35 | ​ | $ | 35,111 | ​ | $ | 509 | ​ | $ | 47,374 | ​ | $ | 785 | ​ | $ | 82,485 | ​ | $ | 1,294
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Less than | ​ | 12 Months | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | 12 Months | ​ | or Greater | ​ | Total
​ | ​ | ​ | ​ | Estimated | ​ | ​ | ​ | ​ | Estimated | ​ | ​ | ​ | ​ | Estimated | ​ | ​ | ​
December 31, 2019 | ​ | Number of | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
(dollars in thousands) |  | Securities |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
U. S. agency securities |  | 36 | ​ | $ | 75,159 | ​ | $ | 439 | ​ | $ | 51,481 | ​ | $ | 616 | ​ | $ | 126,640 | ​ | $ | 1,055
Residential mortgage backed securities |  | 111 | ​ |  | 197,794 | ​ |  | 1,148 | ​ |  | 90,742 | ​ |  | 827 | ​ |  | 288,536 | ​ |  | 1,975
Municipal bonds |  | 1 | ​ |  | 1,994 | ​ |  | 5 | ​ |  | — | ​ |  | — | ​ |  | 1,994 | ​ |  | 5
​ |  | 148 | ​ | $ | 274,947 | ​ | $ | 1,592 | ​ | $ | 142,223 | ​ | $ | 1,443 | ​ | $ | 417,170 | ​ | $ | 3,035
Schedule of amortized cost and estimated fair value of investments available-for-sale by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2020 | ​ | December 31, 2019
​ | ​ | Amortized | ​ | Estimated | ​ | Amortized | ​ | Estimated
(dollars in thousands) |  | Cost |  | Fair Value |  | Cost |  | Fair Value
U. S. agency securities maturing: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
One year or less | ​ | $ | 61,706 | ​ | $ | 62,055 | ​ | $ | 96,332 | ​ | $ | 96,226
After one year through five years | ​ |  | 80,513 | ​ |  | 81,106 | ​ |  | 76,121 | ​ |  | 75,821
Five years through ten years | ​ |  | 4,729 | ​ |  | 4,598 | ​ |  | 7,775 | ​ |  | 7,747
Residential mortgage backed securities | ​ |  | 531,784 | ​ |  | 547,388 | ​ |  | 541,490 | ​ |  | 543,852
Municipal bonds maturing: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
One year or less | ​ |  | 6,400 | ​ |  | 6,456 | ​ |  | 5,897 | ​ |  | 5,969
After one year through five years | ​ |  | 20,844 | ​ |  | 21,437 | ​ |  | 21,416 | ​ |  | 21,953
Five years through ten years | ​ |  | 43,584 | ​ |  | 45,656 | ​ |  | 42,589 | ​ |  | 44,015
After ten years | ​ |  | 2,000 | ​ |  | 2,039 | ​ |  | 2,000 | ​ |  | 1,994
Corporate bonds maturing: | ​ |  | ​ | ​ |  | ​ | ​ |  |  | ​ |  |
One year or less | ​ | ​ | 10,972 | ​ | ​ | 11,054 | ​ | ​ | 502 | ​ | ​ | 508
After one year through five years | ​ |  | 35,891 | ​ |  | 36,600 | ​ |  | 8,528 | ​ |  | 8,725
After ten years | ​ |  | 5,224 | ​ |  | 5,330 | ​ |  | 1,500 | ​ |  | 1,500
U.S. treasury | ​ | ​ | 34,986 | ​ | ​ | 34,999 | ​ | ​ | 34,844 | ​ | ​ | 34,855
Other equity investments | ​ |  | 198 | ​ |  | 198 | ​ |  | 198 | ​ |  | 198
​ | ​ | $ | 838,831 | ​ | $ | 858,916 | ​ | $ | 839,192 | ​ | $ | 843,363

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 + Details
Name: | us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration