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Fair Value of Assets and Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2021
Fair Value Disclosures [Abstract] |
Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis | The table below presents the balances of assets and liabilities measured at fair value on a recurring basis as of September 30, 2021, and December 31, 2020:
|  | Quoted Prices in Active Markets for Identical Assets or Liabilities |  |  | Significant Other Observable Inputs |  |  | Significant Unobservable Inputs |  |  |  |  |
(dollars in thousands) |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities Issued by the U.S. Treasury and Government Agencies |  | $ | 751 |  |  | $ | 144,113 |  |  | $ | — |  |  | $ | 144,864 |
Debt Securities Issued by States and Political Subdivisions |  |  | — |  |  |  | 21,068 |  |  |  | — |  |  |  | 21,068 |
Debt Securities Issued by U.S. Government-Sponsored Enterprises |  |  | — |  |  |  | 1,555 |  |  |  | — |  |  |  | 1,555 |
Debt Securities Issued by Corporations |  |  | — |  |  |  | 387,874 |  |  |  | — |  |  |  | 387,874 |
Mortgage-Backed Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential - Government Agencies |  |  | — |  |  |  | 1,417,183 |  |  |  | — |  |  |  | 1,417,183 |
Residential - U.S. Government-Sponsored Enterprises |  |  | — |  |  |  | 2,200,052 |  |  |  | — |  |  |  | 2,200,052 |
Commercial - Government Agencies |  |  | — |  |  |  | 180,924 |  |  |  | — |  |  |  | 180,924 |
Total Mortgage-Backed Securities |  |  | — |  |  |  | 3,798,159 |  |  |  | — |  |  |  | 3,798,159 |
Total Investment Securities Available-for-Sale |  |  | 751 |  |  |  | 4,352,769 |  |  |  | — |  |  |  | 4,353,520 |
Loans Held for Sale |  |  | — |  |  |  | 21,965 |  |  |  | — |  |  |  | 21,965 |
Mortgage Servicing Rights |  |  | — |  |  |  | — |  |  |  | 826 |  |  |  | 826 |
Other Assets |  |  | 55,167 |  |  |  | — |  |  |  | — |  |  |  | 55,167 |
Derivatives 1 |  |  | — |  |  |  | 288 |  |  |  | 48,433 |  |  |  | 48,721 |
Total Assets Measured at Fair Value on a Recurring Basis as of September 30, 2021 |  | $ | 55,918 |  |  | $ | 4,375,022 |  |  | $ | 49,259 |  |  | $ | 4,480,199 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives 1 |  | $ | — |  |  | $ | 720 |  |  | $ | 17,324 |  |  | $ | 18,044 |
Total Liabilities Measured at Fair Value on a Recurring Basis as of September 30, 2021 |  | $ | — |  |  | $ | 720 |  |  | $ | 17,324 |  |  | $ | 18,044 |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities Issued by the U.S. Treasury and Government Agencies |  | $ | 921 |  |  | $ | 173,324 |  |  | $ | — |  |  | $ | 174,245 |
Debt Securities Issued by States and Political Subdivisions |  |  | — |  |  |  | 24,840 |  |  |  | — |  |  |  | 24,840 |
Debt Securities Issued by U.S. Government-Sponsored Enterprises |  |  | — |  |  |  | 1,062 |  |  |  | — |  |  |  | 1,062 |
Debt Securities Issued by Corporations |  |  | — |  |  |  | 224,605 |  |  |  | — |  |  |  | 224,605 |
Mortgage-Backed Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential - Government Agencies |  |  | — |  |  |  | 1,594,815 |  |  |  | — |  |  |  | 1,594,815 |
Residential - U.S. Government-Sponsored Enterprises |  |  | — |  |  |  | 1,518,283 |  |  |  | — |  |  |  | 1,518,283 |
Commercial - Government Agencies |  |  | — |  |  |  | 253,839 |  |  |  | — |  |  |  | 253,839 |
Total Mortgage-Backed Securities |  |  | — |  |  |  | 3,366,937 |  |  |  | — |  |  |  | 3,366,937 |
Total Investment Securities Available-for-Sale |  |  | 921 |  |  |  | 3,790,768 |  |  |  | — |  |  |  | 3,791,689 |
Loans Held for Sale |  |  | — |  |  |  | 82,565 |  |  |  | — |  |  |  | 82,565 |
Mortgage Servicing Rights |  |  | — |  |  |  | — |  |  |  | 958 |  |  |  | 958 |
Other Assets |  |  | 53,410 |  |  |  | — |  |  |  | — |  |  |  | 53,410 |
Derivatives 1 |  |  | — |  |  |  | 878 |  |  |  | 95,289 |  |  |  | 96,167 |
Total Assets Measured at Fair Value on a Recurring Basis as of December 31, 2020 |  | $ | 54,331 |  |  | $ | 3,874,211 |  |  | $ | 96,247 |  |  | $ | 4,024,789 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives 1 |  | $ | — |  |  | $ | 752 |  |  | $ | 17,409 |  |  | $ | 18,161 |
Total Liabilities Measured at Fair Value on a Recurring Basis as of December 31, 2020 |  | $ | — |  |  | $ | 752 |  |  | $ | 17,409 |  |  | $ | 18,161 |
1 | The fair value of each class of derivatives is shown in Note 11 Derivative Financial Instruments.
Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis | For the three and nine months ended September 30, 2021, and September 30, 2020, the changes in Level 3 assets and liabilities measured at fair value on a recurring basis were as follows:
(dollars in thousands) |  | Mortgage Servicing Rights 1 |  |  | Net Derivative Assets and Liabilities 2 |
Three Months Ended September 30, 2021 |  |  |  |  |  |  |  |
Balance as of July 1, 2021 |  | $ | 875 |  |  | $ | 37,957 |
Realized and Unrealized Net Gains (Losses): |  |  |  |  |  |  |  |
Included in Net Income |  |  | (49 | ) |  |  | 2,095 |
Transfers to Loans Held for Sale |  |  | — |  |  |  | (3,068 | )
Variation Margin Payments |  |  | — |  |  |  | (5,875 | )
Balance as of September 30, 2021 |  | $ | 826 |  |  | $ | 31,109 |
Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held as of September 30, 2021 |  | $ | — |  |  | $ | 31,109 |
Three Months Ended September 30, 2020 |  |  |  |  |  |  |  |
Balance as of July 1, 2020 |  | $ | 1,068 |  |  | $ | 88,995 |
Realized and Unrealized Net Gains (Losses): |  |  |  |  |  |  |  |
Included in Net Income |  |  | (50 | ) |  |  | 4,909 |
Transfers to Loans Held for Sale |  |  | — |  |  |  | (4,242 | )
Variation Margin Payments |  |  | — |  |  |  | (1,840 | )
Balance as of September 30, 2020 |  | $ | 1,018 |  |  | $ | 87,822 |
Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held as of September 30, 2020 |  | $ | — |  |  | $ | 87,822 |
Nine Months Ended September 30, 2021 |  |  |  |  |  |  |  |
Balance as of January 1, 2021 |  | $ | 958 |  |  |  | 77,880 |
Realized and Unrealized Net Gains (Losses): |  |  |  |  |  |  |  |
Included in Net Income |  |  | (132 | ) |  |  | 7,008 |
Transfers to Loans Held for Sale |  |  | — |  |  |  | (10,652 | )
Variation Margin Payments |  |  | — |  |  |  | (43,127 | )
Balance as of September 30, 2021 |  | $ | 826 |  |  |  | 31,109 |
Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held as of September 30, 2021 |  | $ | — |  |  | $ | 31,109 |
Nine Months Ended September 30, 2020 |  |  |  |  |  |  |  |
Balance as of January 1, 2020 |  | $ | 1,126 |  |  | $ | 22,573 |
Realized and Unrealized Net Gains (Losses): |  |  |  |  |  |  |  |
Included in Net Income |  |  | (108 | ) |  |  | 15,372 |
Transfers to Loans Held for Sale |  |  | — |  |  |  | (13,521 | )
Variation Margin Payments |  |  | — |  |  |  | 63,398 |
Balance as of September 30, 2020 |  | $ | 1,018 |  |  | $ | 87,822 |
Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held as of September 30, 2020 |  | $ | — |  |  | $ | 87,822 |
1 | Realized and unrealized gains and losses related to mortgage servicing rights are reported as a component of mortgage banking income in the Company’s consolidated statements of income.
2 | Realized and unrealized gains and losses related to interest rate lock commitments are reported as a component of mortgage banking income in the Company’s consolidated statements of income. Realized and unrealized gains and losses related to interest rate swap agreements are reported as a component of other noninterest income in the Company’s consolidated statements of income.
Summary of the Significant Unobservable Inputs | For Level 3 assets and liabilities measured at fair value on a recurring or nonrecurring basis as of September 30, 2021, and December 31, 2020, the significant unobservable inputs used in the fair value measurements were as follows:
(dollars in thousands) |  | Valuation Technique |  | Description |  | Range |  |  | Weighted Average1 |  |  | Fair Value |
September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Servicing Rights |  | Discounted Cash Flow |  | Constant Prepayment Rate |  |  | 8.13 | % | - |  | 14.43 | % |  |  | 11.50 | % |  | $ | 22,099 |
|  |  |  | Discount Rate |  |  | 5.65 | % | - |  | 6.74 | % |  |  | 6.67 | % |  | $ | — |
Net Derivative Assets and Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Lock Commitments |  | Pricing Model |  | Closing Ratio |  |  | 84.10 | % | - |  | 100.00 | % |  |  | 92.84 | % |  | $ | 1,222 |
Interest Rate Swap Agreements |  | Discounted Cash Flow |  | Credit Factor |  |  | 0.00 | % | - |  | 0.49 | % |  |  | 0.14 | % |  | $ | 29,887 |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Servicing Rights |  | Discounted Cash Flow |  | Constant Prepayment Rate |  |  | 8.71 | % | - |  | 15.89 | % |  |  | 14.42 | % |  | $ | 19,652 |
|  |  |  | Discount Rate |  |  | 5.69 | % | - |  | 6.28 | % |  |  | 5.81 | % |  | $ | — |
Net Derivative Assets and Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Lock Commitments |  | Pricing Model |  | Closing Ratio |  |  | 84.10 | % | - |  | 99.00 | % |  |  | 90.76 | % |  | $ | 4,947 |
Interest Rate Swap Agreements |  | Discounted Cash Flow |  | Credit Factor |  |  | 0.00 | % | - |  | 0.49 | % |  |  | 0.29 | % |  | $ | 72,933 |
1 | Unobservable inputs for mortgage servicing rights and interest rate lock commitments were weighted by loan amount. Unobservable inputs for interest rate swap agreements were weighted by fair value.
Schedule of Assets Measured at Fair Value on Nonrecurring Basis | The Company may be required periodically to measure certain assets and liabilities at fair value on a nonrecurring basis in accordance with GAAP. These adjustments to fair value usually result from the application of lower-of-cost-or-fair value accounting or impairment write-downs of individual assets. The following table represents the assets measured at fair value on a nonrecurring basis as of September 30, 2021, and December 31, 2020.
(dollars in thousands) |  | Fair Value Hierarchy |  | Net Carrying Amount |  |  | Valuation Allowance |
September 30, 2021 |  |  |  |  |  |  |  |  |  |
Mortgage Servicing Rights - amortization method |  | Level 3 |  | $ | 21,273 |  |  | $ | (2,107 | )
December 31, 2020 |  |  |  |  |  |  |  |  |  |
Mortgage Servicing Rights - amortization method |  | Level 3 |  | $ | 18,694 |  |  | $ | (3,892 | )
Schedule of Difference between Aggregate Fair Value and Aggregate Unpaid Principal Balance | The following table reflects the difference between the aggregate fair value and the aggregate unpaid principal balance of the Company’s residential mortgage loans held for sale as of September 30, 2021, and December 31, 2020.
(dollars in thousands) |  | Aggregate Fair Value |  |  | Aggregate Unpaid Principal |  |  | Aggregate Fair Value Less Aggregate Unpaid Principal |
September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Loans Held for Sale |  | $ | 21,965 |  |  | $ | 21,376 |  |  | $ | 589 |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Loans Held for Sale |  | $ | 82,565 |  |  | $ | 78,577 |  |  | $ | 3,988 |
Schedule of Carrying Amount, Fair Value, and Fair Value Hierarchy of Financial Instruments | The following presents the carrying amount, fair value, and placement in the fair value hierarchy of the Company’s financial instruments not recorded at fair value on a recurring basis as of September 30, 2021, and December 31, 2020. This table excludes financial instruments for which the carrying amount approximates fair value. For short-term financial assets such as cash and cash equivalents, the carrying amount is a reasonable estimate of fair value due to the relatively short time between the origination of the instrument and its expected realization. For non-marketable equity securities such as Federal Home Loan Bank and Federal Reserve Bank stock, the carrying amount is a reasonable estimate of fair value as these securities can only be redeemed or sold at their par value and only to the respective issuing government supported institution or to another member institution. For financial liabilities such as noninterest-bearing demand, interest-bearing demand, and savings deposits, the carrying amount is a reasonable estimate of fair value due to these products having no stated maturity.
|  |  |  |  |  |  |  |  |  | Fair Value Measurements |
|  | Carrying |  |  |  |  |  |  | Quoted Prices in Active Markets for Identical Assets or Liabilities |  |  | Significant Other Observable Inputs |  |  | Significant Unobservable Inputs |
(dollars in thousands) |  | Amount |  |  | Fair Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Instruments - Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Securities Held-to-Maturity |  | $ | 4,899,880 |  |  | $ | 4,895,763 |  |  | $ | 131,558 |  |  | $ | 4,764,205 |  |  | $ | — |
Loans 1 |  |  | 11,718,951 |  |  |  | 11,962,539 |  |  |  | — |  |  |  | — |  |  |  | 11,962,539 |
Financial Instruments - Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time Deposits |  |  | 1,072,915 |  |  |  | 1,074,210 |  |  |  | — |  |  |  | 1,074,210 |  |  |  | — |
Securities Sold Under Agreements to Repurchase |  |  | 450,490 |  |  |  | 477,228 |  |  |  | — |  |  |  | 477,228 |  |  |  | — |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Instruments - Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Securities Held-to-Maturity |  | $ | 3,262,727 |  |  | $ | 3,348,693 |  |  | $ | 7,500 |  |  | $ | 3,341,193 |  |  | $ | — |
Loans 1 |  |  | 11,536,011 |  |  |  | 12,019,151 |  |  |  | — |  |  |  | — |  |  |  | 12,019,151 |
Financial Instruments - Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time Deposits |  |  | 1,662,063 |  |  |  | 1,667,774 |  |  |  | — |  |  |  | 1,667,774 |  |  |  | — |
Securities Sold Under Agreements to Repurchase |  |  | 600,590 |  |  |  | 649,039 |  |  |  | — |  |  |  | 649,039 |  |  |  | — |
Other Debt 2 |  |  | 50,000 |  |  |  | 51,546 |  |  |  | — |  |  |  | 51,546 |  |  |  | — |
1 | Carrying amount is net of unearned income and the Allowance.
2 | Excludes finance lease obligations.

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- Definition Tabular disclosure of the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset and liability. + References No definition available. + Details
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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of information about asset and liability measured at fair value under fair value option. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14210-108612 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14172-108612 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14217-108612 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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