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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value Measurements [Abstract] |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | June 30, 2018
﻿(in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
﻿Assets |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |
﻿U.S. Treasury and government agency securities |  | $ | — |  | $ | 90,985 |  | $ | — |  | $ | 90,985
﻿Municipal obligations |  |  | — |  |  | 236,010 |  |  | — |  |  | 236,010
﻿Corporate debt securities |  |  | — |  |  | 3,500 |  |  | — |  |  | 3,500
﻿Residential mortgage-backed securities |  |  | — |  |  | 1,774,871 |  |  | — |  |  | 1,774,871
﻿Commercial mortgage-backed securities |  |  | — |  |  | 729,532 |  |  | — |  |  | 729,532
﻿Collateralized mortgage obligations |  |  | — |  |  | 146,775 |  |  | — |  |  | 146,775
﻿Total available for sale securities |  |  | — |  |  | 2,981,673 |  |  | — |  |  | 2,981,673
﻿Derivative assets (1) |  |  | — |  |  | 11,428 |  |  | — |  |  | 11,428
﻿Total recurring fair value measurements - assets |  | $ | — |  | $ | 2,993,101 |  | $ | — |  | $ | 2,993,101
﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |
﻿Derivative liabilities (1) |  | $ | — |  | $ | 25,953 |  | $ | — |  | $ | 25,953
﻿Total recurring fair value measurements - liabilities |  | $ | — |  | $ | 25,953 |  | $ | — |  | $ | 25,953
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | 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 6 - Derivatives.
Financial Assets Measured at Fair Value on Nonrecurring Basis |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | June 30, 2018
﻿(in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
﻿Collateral-dependent impaired loans |  | $ | — |  | $ | 206,110 |  | $ | — |  | $ | 206,110
﻿Other real estate owned |  |  | — |  |  | — |  |  | 5,926 |  |  | 5,926
﻿Total nonrecurring fair value measurements |  | $ | — |  | $ | 206,110 |  | $ | 5,926 |  | $ | 212,036
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﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | December 31, 2017
﻿(in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
﻿Collateral-dependent impaired loans |  | $ | — |  | $ | 184,205 |  | $ | — |  | $ | 184,205
﻿Other real estate owned |  |  | — |  |  | — |  |  | 6,928 |  |  | 6,928
﻿Total nonrecurring fair value measurements |  | $ | — |  | $ | 184,205 |  | $ | 6,928 |  | $ | 191,133
﻿
Estimated Fair Values of Financial Instruments |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | June 30, 2018
﻿ |  |  |  |  |  |  |  |  |  |  | Total Fair |  | Carrying
﻿(in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Value |  | Amount
﻿Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash, interest-bearing bank deposits, and federal funds sold |  | $ | 459,282 |  | $ | — |  | $ | — |  | $ | 459,282 |  | $ | 459,282
﻿Available for sale securities |  |  | — |  |  | 2,981,673 |  |  | — |  |  | 2,981,673 |  |  | 2,981,673
﻿Held to maturity securities |  |  | — |  |  | 3,054,469 |  |  | — |  |  | 3,054,469 |  |  | 3,132,200
﻿Loans, net |  |  | — |  |  | 206,110 |  |  | 18,633,620 |  |  | 18,839,730 |  |  | 19,156,387
﻿Loans held for sale |  |  | — |  |  | 36,047 |  |  | — |  |  | 36,047 |  |  | 36,047
﻿Derivative financial instruments |  |  | — |  |  | 11,428 |  |  | — |  |  | 11,428 |  |  | 11,428
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Deposits |  | $ | — |  | $ | — |  | $ | 22,187,823 |  | $ | 22,187,823 |  | $ | 22,235,338
﻿Federal funds purchased |  |  | 525 |  |  | — |  |  | — |  |  | 525 |  |  | 525
﻿Securities sold under agreements to repurchase |  |  | 452,994 |  |  | — |  |  | — |  |  | 452,994 |  |  | 452,994
﻿FHLB short-term borrowings |  |  | 1,860,671 |  |  | — |  |  | — |  |  | 1,860,671 |  |  | 1,860,671
﻿Long-term debt |  |  | — |  |  | 263,134 |  |  | — |  |  | 263,134 |  |  | 266,009
﻿Derivative financial instruments |  |  | — |  |  | 25,953 |  |  | — |  |  | 25,953 |  |  | 25,953
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | December 31, 2017
﻿ |  |  |  |  |  |  |  |  |  |  | Total Fair |  | Carrying
﻿(in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | 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 short-term 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 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 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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