XML 51 R41.htm IDEA: XBRL DOCUMENT
v3.22.1

Investment Securities - Summary of Amortized Cost and Fair Value of Securities (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | $ 1,784,458,000 | $ 1,673,798,000
Gross unrealized gains | 4,232,000 | 23,120,000
Gross unrealized losses | (105,165,000) | (18,393,000)
Allowance for credit losses for investments | 0 | 0
Fair Value | 1,683,525,000 | 1,678,525,000
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 41,015,000 | 34,023,000
Gross unrealized gains | 0 | 18,000
Gross unrealized losses | (2,133,000) | (171,000)
Allowance for credit losses for investments | 0 | 0
Fair Value | 38,882,000 | 33,870,000
Mortgage-backed securities - residential |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 1,320,205,000 | 1,281,285,000
Gross unrealized gains | 616,000 | 6,072,000
Gross unrealized losses | (88,565,000) | (17,985,000)
Allowance for credit losses for investments | 0 | 0
Fair Value | 1,232,256,000 | 1,269,372,000
Mortgage-backed securities - commercial |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 14,738,000 | 15,024,000
Gross unrealized gains | 14,000 | 272,000
Gross unrealized losses | (445,000) | (46,000)
Allowance for credit losses for investments | 0 | 0
Fair Value | 14,307,000 | 15,250,000
Municipal securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 318,587,000 | 322,052,000
Gross unrealized gains | 3,594,000 | 16,718,000
Gross unrealized losses | (12,043,000) | (160,000)
Allowance for credit losses for investments | 0 | 0
Fair Value | 310,138,000 | 338,610,000
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 81,913,000 | 14,914,000
Gross unrealized gains | 4,000 | 0
Gross unrealized losses | (1,744,000) | (6,000)
Allowance for credit losses for investments | 0 | 0
Fair Value | 80,173,000 | 14,908,000
Corporate securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 8,000,000 | 6,500,000
Gross unrealized gains | 4,000 | 40,000
Gross unrealized losses | (235,000) | (25,000)
Allowance for credit losses for investments | 0 | 0
Fair Value | $ 7,769,000 | $ 6,515,000

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |