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Fair Value of Assets and Liabilities (Tables)
 9 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Fair value measurement of assets measured at fair value on a recurring basis
The following tables disclose the fair value measurement of assets and liabilities measured at fair value on a recurring basis:
  
  Fair Value Measurements
At the End of the Reporting Period Using
(Dollars in thousands)
Fair Value
September 30, 2024
Quoted Prices
in Active  Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Debt securities, available-for-sale
U.S. government and federal agency$467,606 — 467,606 — 
U.S. government sponsored enterprises310,069 — 310,069 — 
State and local governments72,370 — 72,370 — 
Corporate bonds14,542 — 14,542 — 
Residential mortgage-backed securities2,524,204 — 2,524,204 — 
Commercial mortgage-backed securities1,047,787 — 1,047,787 — 
Loans held for sale, at fair value46,126 — 46,126 — 
Interest rate caps1,883 — 1,883 — 
Interest rate locks985 — 985 — 
Total assets measured at fair value
  on a recurring basis
$4,485,572 — 4,485,572 — 
TBA hedge$311 — 311 — 
Interest rate swap19,839 — 19,839 — 
Total liabilities measured at fair value on a recurring basis
$20,150 — 20,150 — 
  Fair Value Measurements
At the End of the Reporting Period Using
(Dollars in thousands)Fair Value December 31, 2023Quoted Prices
in Active  Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Debt securities, available-for-sale
U.S. government and federal agency$455,347 — 455,347 — 
U.S. government sponsored enterprises299,219 — 299,219 — 
State and local governments98,932 — 98,932 — 
Corporate bonds26,253 — 26,253 — 
Residential mortgage-backed securities2,811,263 — 2,811,263 — 
Commercial mortgage-backed securities1,094,705 — 1,094,705 — 
Loans held for sale, at fair value
15,691 — 15,691 — 
Interest rate caps4,990 — 4,990 — 
Interest rate locks
604 — 604 — 
Total assets measured at fair value on a recurring basis
$4,807,004 — 4,807,004 — 
TBA hedge$350 — 350 — 
Interest rate swap17,988 — 17,988 — 
Total liabilities measured at fair value on a recurring basis
$18,338 — 18,338 — 
Fair value measurement of assets measured at fair value on a non-recurring basis
The following tables disclose the fair value measurement of assets with a recorded change during the period resulting from re-measuring the assets at fair value on a non-recurring basis:
  Fair Value Measurements
At the End of the Reporting Period Using
(Dollars in thousands)
Fair Value
September 30, 2024
Quoted Prices
in Active  Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Other real estate owned$120 — — 120 
Collateral-dependent impaired loans, net of ACL$2,854 — — 2,854 
Total assets measured at fair value
  on a non-recurring basis
$2,974 — — 2,974 

  Fair Value Measurements
At the End of the Reporting Period Using
(Dollars in thousands)Fair Value December 31, 2023Quoted Prices
in Active  Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Other real estate owned$166 — — 166 
Collateral-dependent impaired loans, net of ACL1,332 — — 1,332 
Total assets measured at fair value
  on a non-recurring basis
$1,498 — — 1,498 
Quantitative information about assets measured at fair value on a non-recurring basis for which Level 3 inputs were used
The following tables present additional quantitative information about assets measured at fair value on a non-recurring basis and for which the Company has utilized Level 3 inputs to determine fair value:

 
Fair Value
September 30, 2024
Quantitative Information about Level 3 Fair Value Measurements
(Dollars in thousands)Valuation TechniqueUnobservable Input
Range
(Weighted-Average) 1
Other real estate owned
$120 Sales comparison approachSelling costs
10.0% - 10.0% (10.0%)
Collateral-dependent
  impaired loans, net of ACL
$1,490 Cost approachSelling costs
10.0% - 10.0% (10.0%)
1,103 Sales comparison approachSelling costs
10.0% - 20.0% (10.8%)
Adjustment to comparables
0.0% - 0.0% (0.0%)
261 Combined approachSelling costs
10.0% - 10.0% (10.0%)
$2,854 
 Fair Value December 31, 2023Quantitative Information about Level 3 Fair Value Measurements
(Dollars in thousands)Valuation TechniqueUnobservable Input
Range
(Weighted-Average) 1
Other real estate owned
$166 Sales comparison approachSelling costs
0.0% - 10.0% (8.1%)
Collateral-dependent impaired loans, net of ACL
$1,258 Cost approachSelling costs
10.0% - 10.0% (10.0%)
74 Sales comparison approachSelling Costs
10.0% - 10.0% (10.0%)
$1,332 
______________________________
1 The range for selling cost inputs represents reductions to the fair value of the assets.
Carrying amounts and estimated fair values of financial instruments not carried at fair value The fair value of unused lines of credit and letters of credit is not material; therefore, such commitments are not included in the following tables.
  Fair Value Measurements
At the End of the Reporting Period Using
(Dollars in thousands)
Carrying Amount
September 30, 2024
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Financial assets
Cash and cash equivalents$987,833 987,833 — — 
Debt securities, held-to-maturity3,348,698 — 3,080,549 — 
Loans receivable, net of ACL16,976,017 — — 17,089,754 
Total financial assets$21,312,548 987,833 3,080,549 17,089,754 
Financial liabilities
Term deposits$3,284,609 — 3,329,142 — 
FHLB advances1,800,000 — 1,796,520 — 
Repurchase agreements and
  other borrowed funds
1,915,669 — 1,915,669 — 
Subordinated debentures133,065 — 121,219 — 
Total financial liabilities$7,133,343 — 7,162,550 — 

  Fair Value Measurements
At the End of the Reporting Period Using
(Dollars in thousands)Carrying Amount December 31, 2023Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Financial assets
Cash and cash equivalents$1,354,342 1,354,342 — — 
Debt securities, held-to-maturity3,502,411 — 3,180,194 — 
Loans receivable, net of ACL16,005,325 — — 16,133,681 
Total financial assets$20,862,078 1,354,342 3,180,194 16,133,681 
Financial liabilities
Term deposits$2,915,393 — 2,955,521 — 
FRB Bank Term Funding2,740,000 — 2,738,031 — 
Repurchase agreements and
  other borrowed funds
1,568,545 — 1,568,545 — 
Subordinated debentures132,943 — 119,768 — 
Total financial liabilities$7,356,881 — 7,381,865 —