XML 37 R25.htm IDEA: XBRL DOCUMENT
v3.21.2

INVESTMENT SECURITIES (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2021
INVESTMENT SECURITIES |
Schedule of amortized cost and estimated fair value of investment securities | The amortized cost and estimated fair value of investment securities as of June 30, 2021 and December 31, 2020 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021 | ​ | December 31, 2020
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(000's omitted) |  | Cost |  | Gains |  | Losses |  | Value |  | Cost |  | Gains |  | Losses |  | Value
Available-for-Sale Portfolio: | ​ | ​ | ​ |  | ​ |  |  | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ |  |  | ​ |  | ​ | ​ | ​
U.S. Treasury and agency securities | ​ | $ | 3,082,187 | ​ | $ | 52,960 | ​ | $ | 110,075 | ​ | $ | 3,025,072 | ​ | $ | 2,423,236 | ​ | $ | 94,741 | ​ | $ | 16,595 | ​ | $ | 2,501,382
Obligations of state and political subdivisions | ​ |  | 405,245 | ​ |  | 20,908 | ​ |  | 1 | ​ |  | 426,152 | ​ |  | 451,028 | ​ |  | 24,632 | ​ |  | 0 | ​ |  | 475,660
Government agency mortgage-backed securities | ​ |  | 521,056 | ​ |  | 10,999 | ​ |  | 2,916 | ​ |  | 529,139 | ​ |  | 506,540 | ​ |  | 16,280 | ​ |  | 182 | ​ |  | 522,638
Corporate debt securities | ​ |  | 3,000 | ​ |  | 94 | ​ |  | 0 | ​ |  | 3,094 | ​ |  | 4,499 | ​ |  | 137 | ​ |  | 1 | ​ |  | 4,635
Government agency collateralized mortgage obligations | ​ |  | 28,490 | ​ |  | 796 | ​ |  | 4 | ​ |  | 29,282 | ​ |  | 42,476 | ​ |  | 1,111 | ​ |  | 10 | ​ |  | 43,577
Total available-for-sale portfolio | ​ | $ | 4,039,978 | ​ | $ | 85,757 | ​ | $ | 112,996 | ​ | $ | 4,012,739 | ​ | $ | 3,427,779 | ​ | $ | 136,901 | ​ | $ | 16,788 | ​ | $ | 3,547,892
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity and other Securities: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Equity securities, at fair value | ​ | $ | 251 | ​ | $ | 218 | ​ | $ | 0 | ​ | $ | 469 | ​ | $ | 251 | ​ | $ | 194 | ​ | $ | 0 | ​ | $ | 445
Federal Home Loan Bank common stock | ​ |  | 7,262 | ​ |  | 0 | ​ |  | 0 | ​ |  | 7,262 | ​ |  | 7,468 | ​ |  | 0 | ​ |  | 0 | ​ |  | 7,468
Federal Reserve Bank common stock | ​ |  | 33,916 | ​ |  | 0 | ​ |  | 0 | ​ |  | 33,916 | ​ |  | 33,916 | ​ |  | 0 | ​ |  | 0 | ​ |  | 33,916
Other equity securities, at adjusted cost | ​ |  | 2,526 | ​ |  | 750 | ​ |  | 0 | ​ |  | 3,276 | ​ |  | 4,876 | ​ |  | 750 | ​ |  | 0 | ​ |  | 5,626
Total equity and other securities | ​ | $ | 43,955 | ​ | $ | 968 | ​ | $ | 0 | ​ | $ | 44,923 | ​ | $ | 46,511 | ​ | $ | 944 | ​ | $ | 0 | ​ | $ | 47,455
Schedule of investment securities that have been in a continuous unrealized loss position for less than or greater than twelve months | A summary of investment securities that have been in a continuous unrealized loss position is as follows: As of June 30, 2021 ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Less than 12 Months |  | 12 Months or Longer |  | Total
​ | ​ | ​ | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ | ​ | ​ | ​ | Gross
​ | ​ | ​ | ​ | Fair | ​ | Unrealized | ​ | ​ | ​ | Fair | ​ | Unrealized | ​ | ​ | ​ | Fair | ​ | Unrealized
(000's omitted) |  | # |  | Value |  | Losses |  | # |  | Value |  | Losses |  | # |  | Value |  | Losses
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-Sale Portfolio: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ |  | ​ | ​ |  | ​ | ​ |
U.S. Treasury and agency securities | ​ | 29 | ​ | $ | 1,272,423 | ​ | $ | 110,075 | ​ | 0 | ​ | $ | 0 | ​ | $ | 0 | ​ | 29 | ​ | $ | 1,272,423 | ​ | $ | 110,075
Obligations of state and political subdivisions | ​ | 4 | ​ |  | 1,651 | ​ |  | 1 | ​ | 0 | ​ |  | 0 | ​ |  | 0 | ​ | 4 | ​ |  | 1,651 | ​ |  | 1
Government agency mortgage-backed securities | ​ | 126 | ​ |  | 170,661 | ​ |  | 2,914 | ​ | 6 | ​ |  | 1,146 | ​ |  | 2 | ​ | 132 | ​ |  | 171,807 | ​ |  | 2,916
Government agency collateralized mortgage obligations | ​ | 3 | ​ |  | 1,804 | ​ |  | 3 | ​ | 3 | ​ |  | 182 | ​ |  | 1 | ​ | 6 | ​ |  | 1,986 | ​ |  | 4
Total available-for-sale investment portfolio | ​ | 162 | ​ | $ | 1,446,539 | ​ | $ | 112,993 | ​ | 9 | ​ | $ | 1,328 | ​ | $ | 3 | ​ | 171 | ​ | $ | 1,447,867 | ​ | $ | 112,996
​ As of December 31, 2020 ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Less than 12 Months |  | 12 Months or Longer |  | Total
​ | ​ | ​ | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ | ​ | ​ | ​ | Gross
​ | ​ | ​ | ​ | Fair | ​ | Unrealized | ​ | ​ | ​ | Fair | ​ | Unrealized | ​ | ​ | ​ | Fair | ​ | Unrealized
(000's omitted) |  | # |  | Value |  | Losses |  | # |  | Value |  | Losses |  | # |  | Value |  | Losses
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-Sale Portfolio: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ |  | ​ | ​ | ​ | ​ | ​ |
U.S. Treasury and agency securities | ​ | 13 | ​ | $ | 831,015 | ​ | $ | 16,595 | ​ | 0 | ​ | $ | 0 | ​ | $ | 0 | ​ | 13 | ​ | $ | 831,015 | ​ | $ | 16,595
Obligations of state and political subdivisions | ​ | 1 | ​ |  | 358 | ​ |  | 0 | ​ | 0 | ​ |  | 0 | ​ |  | 0 | ​ | 1 | ​ |  | 358 | ​ |  | 0
Government agency mortgage-backed securities | ​ | 89 | ​ |  | 75,992 | ​ |  | 182 | ​ | 2 | ​ |  | 14 | ​ |  | 0 | ​ | 91 | ​ |  | 76,006 | ​ |  | 182
Corporate debt securities | ​ | 1 | ​ | ​ | 1,001 | ​ | ​ | 1 | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0 | ​ | 1 | ​ | ​ | 1,001 | ​ | ​ | 1
Government agency collateralized mortgage obligations | ​ | 13 | ​ |  | 5,246 | ​ |  | 10 | ​ | 1 | ​ |  | 0 | ​ |  | 0 | ​ | 14 | ​ |  | 5,246 | ​ |  | 10
Total available-for-sale investment portfolio | ​ | 117 | ​ | $ | 913,612 | ​ | $ | 16,788 | ​ | 3 | ​ | $ | 14 | ​ | $ | 0 | ​ | 120 | ​ | $ | 913,626 | ​ | $ | 16,788
​
Schedule of amortized cost and estimated fair value of debt securities by contractual maturity | The amortized cost and estimated fair value of debt securities at June 30, 2021, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Available-for-Sale
​ | ​ | Amortized | ​ | Fair
(000's omitted) |  | Cost |  | Value
Due in one year or less | ​ | $ | 198,566 | ​ | $ | 199,557
Due after one through five years | ​ |  | 768,349 | ​ |  | 796,228
Due after five years through ten years | ​ |  | 1,018,820 | ​ |  | 1,037,749
Due after ten years | ​ |  | 1,504,697 | ​ |  | 1,420,784
Subtotal | ​ |  | 3,490,432 | ​ |  | 3,454,318
Government agency mortgage-backed securities | ​ |  | 521,056 | ​ |  | 529,139
Government agency collateralized mortgage obligations | ​ |  | 28,490 | ​ |  | 29,282
Total | ​ | $ | 4,039,978 | ​ | $ | 4,012,739

X
- Definition Tabular disclosure of investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -URI http://asc.fasb.org/topic&trid=2197064 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -URI http://asc.fasb.org/topic&trid=75115024 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -URI http://asc.fasb.org/topic&trid=2196965 + Details
Name: | us-gaap_InvestmentTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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 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=121645371&loc=d3e27290-111563 + Details
Name: | us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration