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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value of Financial Instruments [Abstract] |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | December 31, 2018
﻿(in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
﻿Assets |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |
﻿U.S. Treasury and government agency securities |  | $ | — |  | $ | 71,706 |  | $ | — |  | $ | 71,706
﻿Municipal obligations |  |  | — |  |  | 240,427 |  |  | — |  |  | 240,427
﻿Corporate debt securities |  |  | — |  |  | 3,500 |  |  | — |  |  | 3,500
﻿Residential mortgage-backed securities |  |  | — |  |  | 1,443,402 |  |  | — |  |  | 1,443,402
﻿Commercial mortgage-backed securities |  |  | — |  |  | 770,077 |  |  | — |  |  | 770,077
﻿Collateralized mortgage obligations |  |  | — |  |  | 161,925 |  |  | — |  |  | 161,925
﻿Total available for sale securities |  |  | — |  |  | 2,691,037 |  |  | — |  |  | 2,691,037
﻿Derivative assets (1) |  |  | — |  |  | 16,980 |  |  | — |  |  | 16,980
﻿Total recurring fair value measurements - assets |  | $ | — |  | $ | 2,708,017 |  | $ | — |  | $ | 2,708,017
﻿Liabilities |  |  | — |  |  |  |  |  | — |  |  |
﻿Derivative liabilities (1) |  | $ | — |  | $ | 14,923 |  | $ | 7,304 |  | $ | 22,227
﻿Total recurring fair value measurements - liabilities |  | $ | — |  | $ | 14,923 |  | $ | 7,304 |  | $ | 22,227
﻿
| (1) |  | For further disaggregation of derivative assets and liabilities, see Note 10 – Derivatives.
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | December 31, 2017
﻿(in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
﻿Assets |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |
﻿U.S. Treasury and government agency securities |  | $ | — |  | $ | 97,272 |  | $ | — |  | $ | 97,272
﻿Municipal obligations |  |  | — |  |  | 243,786 |  |  | — |  |  | 243,786
﻿Corporate debt securities |  |  | — |  |  | 3,500 |  |  | — |  |  | 3,500
﻿Residential mortgage-backed securities |  |  | — |  |  | 1,715,213 |  |  | — |  |  | 1,715,213
﻿Commercial mortgage-backed securities |  |  | — |  |  | 687,135 |  |  | — |  |  | 687,135
﻿Collateralized mortgage obligations |  |  | — |  |  | 163,963 |  |  | — |  |  | 163,963
﻿Total available for sale securities |  |  | — |  |  | 2,910,869 |  |  | — |  |  | 2,910,869
﻿Derivative assets (1) |  |  | — |  |  | 14,157 |  |  | — |  |  | 14,157
﻿Total recurring fair value measurements - assets |  | $ | — |  |  | 2,925,026 |  | $ | — |  |  | 2,925,026
﻿Liabilities |  |  |  |  |  |  |  |  | — |  |  |
﻿Derivative liabilities (1) |  | $ | — |  | $ | 14,389 |  | $ | — |  | $ | 14,389
﻿Total recurring fair value measurements - liabilities |  | $ | — |  | $ | 14,389 |  | $ | — |  | $ | 14,389
﻿
| (1) |  | For further disaggregation of derivative assets and liabilities, see Note 10 – Derivatives.
Schedule of Level 3 Fair Value Rollforward |
﻿ |  |  |
﻿Beginning balance |  | $ | -
﻿Entry into derivative contract |  |  | 7,304
﻿Ending balance |  | $ | 7,304
﻿
Overview of the Valuation Techniques and Significant Unobservable Inputs |
﻿ |  |  |  |  |  |
﻿Level 3 Class |  |  | Fair Value at December 31, 2018 | Valuation Technique | Unobservable Input | Values Utilized
﻿ |  |  |  |  | VISA Class A Appreciation | 6.0% - 18.0%
﻿Other derivative liability |  | $ | 7,304 | Discounted cash flow | Conversion rate | 1.62x - 1.59x
﻿ |  |  |  |  | Time until resolution | 24 - 48 months
﻿
Financial Assets Measured at Fair Value on Nonrecurring Basis |
﻿ |  | December 31, 2018 |  |  |
﻿(in thousands) |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total
﻿Collateral dependent impaired loans |  | $ | — |  | $ | 170,918 |  | $ | — |  | $ | 170,918
﻿Other real estate and foreclosed assets, net |  |  | — |  |  | — |  |  | 14,594 |  |  | 14,594
﻿Total nonrecurring fair value measurements |  | $ | — |  | $ | 170,918 |  | $ | 14,594 |  | $ | 185,512
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | December 31, 2017 |  |  |
﻿(in thousands) |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total
﻿Collateral dependent impaired loans |  | $ | — |  | $ | 184,205 |  | $ | — |  | $ | 184,205
﻿Other real estate and foreclosed assets, net |  |  | — |  |  | — |  |  | 19,608 |  |  | 19,608
﻿Total nonrecurring fair value measurements |  | $ | — |  | $ | 184,205 |  | $ | 19,608 |  | $ | 203,813
﻿
Estimated Fair Values of Financial Instruments |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | December 31, 2018 |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  | Total |  | Carrying
﻿(in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Fair Value |  | Amount
﻿Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash, interest-bearing bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿deposits, and federal funds sold |  | $ | 494,466 |  | $ | — |  | $ | — |  | $ | 494,466 |  | $ | 494,466
﻿Available for sale securities |  |  | — |  |  | 2,691,037 |  |  | — |  |  | 2,691,037 |  |  | 2,691,037
﻿Held to maturity securities |  |  | — |  |  | 2,935,856 |  |  | — |  |  | 2,935,856 |  |  | 2,979,547
﻿Loans, net |  |  | — |  |  | 170,918 |  |  | 19,555,969 |  |  | 19,726,887 |  |  | 19,831,897
﻿Loans held for sale |  |  | — |  |  | 28,150 |  |  | — |  |  | 28,150 |  |  | 28,150
﻿Derivative financial instruments |  |  | — |  |  | 16,980 |  |  | — |  |  | 16,980 |  |  | 16,980
﻿Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Deposits |  | $ | — |  | $ | — |  | $ | 23,129,574 |  | $ | 23,129,574 |  | $ | 23,150,185
﻿Federal funds purchased |  |  | 425 |  |  | — |  |  | — |  |  | 425 |  |  | 425
﻿Securities sold under agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿to repurchase |  |  | 428,599 |  |  | — |  |  | — |  |  | 428,599 |  |  | 428,599
﻿Short-term FHLB Borrowings |  |  | 1,160,104 |  |  | — |  |  | — |  |  | 1,160,104 |  |  | 1,160,104
﻿Long-term debt |  |  | — |  |  | 223,135 |  |  | — |  |  | 223,135 |  |  | 224,993
﻿Derivative financial instruments |  |  | — |  |  | 14,923 |  |  | 7,304 |  |  | 22,227 |  |  | 22,227
﻿ ﻿ ﻿ ﻿ ﻿ ﻿ ﻿ ﻿ ﻿ ﻿ ﻿ ﻿ ﻿ ﻿ ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | December 31, 2017 |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  | Total |  | Carrying
﻿(in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Fair Value |  | Amount
﻿Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash, interest-bearing bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿deposits, and federal funds sold |  | $ | 479,332 |  | $ | — |  | $ | — |  | $ | 479,332 |  | $ | 479,332
﻿Available for sale securities |  |  | — |  |  | 2,910,869 |  |  | — |  |  | 2,910,869 |  |  | 2,910,869
﻿Held to maturity securities |  |  | — |  |  | 2,962,010 |  |  | — |  |  | 2,962,010 |  |  | 2,977,511
﻿Loans, net |  |  | — |  |  | 184,205 |  |  | 18,403,303 |  |  | 18,587,508 |  |  | 18,786,855
﻿Loans held for sale |  |  | — |  |  | 39,865 |  |  | — |  |  | 39,865 |  |  | 39,865
﻿Derivative financial instruments |  |  | — |  |  | 14,157 |  |  | — |  |  | 14,157 |  |  | 14,157
﻿Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Deposits |  | $ | — |  | $ | — |  | $ | 22,238,847 |  | $ | 22,238,847 |  | $ | 22,253,202
﻿Federal funds purchased |  |  | 140,754 |  |  | — |  |  | — |  |  | 140,754 |  |  | 140,754
﻿Securities sold under agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿to repurchase |  |  | 430,569 |  |  | — |  |  | — |  |  | 430,569 |  |  | 430,569
﻿FHLB Borrowings |  |  | 1,132,567 |  |  | — |  |  | — |  |  | 1,132,567 |  |  | 1,132,567
﻿Long-term debt |  |  | — |  |  | 303,631 |  |  | — |  |  | 303,631 |  |  | 305,513
﻿Derivative financial instruments |  |  | — |  |  | 14,389 |  |  | — |  |  | 14,389 |  |  | 14,389
﻿

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets 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 (loss), 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, issues, 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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