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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net income, Gross $ 42,693 $ 90,225 $ 58,690 $ 163,919
Unrealized holding gains during the period, Gross 188,768 83,546 94,787 186,472
Non-Credit Portion of OTTI Recognized in OCI; Gross 37,479   (27,911)  
Amounts reclassified into net income: HTM securities, Gross (31) (21) (6) (30)
Realized (gains) losses on disposals and intent-to-sell OTTI on AFS securities, Gross (1,686) (1,300) 9,641 (2,377)
Credit loss (benefit) expense recognized in OTTI, Gross (4,924)   10,863  
Total unrealized gains on investment securities, Gross 219,606 82,225 87,374 184,065
Amount reclassified into net income: Net actuarial loss, Gross 753 664 1,507 1,328
Total defined pension and other post-retirement benefit plans, Gross 753 664 1,507 1,328
Other comprehensive income, Gross 220,359 82,889 88,881 185,393
Comprehensive income before tax 263,052 173,114 147,571 349,312
Net income, Tax 8,510 17,959 9,271 30,305
Unrealized holding gains during the period, Tax 39,641 17,544 19,905 39,157
Non-Credit Portion of OTTI Recognized in OCI; Tax 7,871   (5,861)  
Amounts reclassified into net income: HTM securities, Tax (6) (4) (1) (6)
Realized (gains) losses on disposals and intent-to-sell OTTI on AFS securities, Tax (354) (273) 2,025 (499)
Credit loss (benefit) expense recognized in OTTI, Tax (1,034)   2,281  
Total unrealized gains on investment securities, Tax 46,118 17,267 18,349 38,652
Amount reclassified into net income: Net actuarial loss, Tax 158 140 316 279
Total defined pension and other post-retirement benefit plans, Tax 158 140 316 279
Other comprehensive income, Tax 46,276 17,407 18,665 38,931
Comprehensive income, Tax 54,786 35,366 27,936 69,236
Net income 34,183 72,266 49,419 133,614
Unrealized holding gains arising during period 149,127 66,002 74,882 147,315
Non-Credit Portion of OTTI Recognized in OCI 29,608 0 (22,050) 0
Amounts reclassified into net income: HTM Securities (25) (17) (5) (24)
Realized (gains) losses on disposals and intent-to-sell OTTI on AFS Securities (1,332) (1,027) 7,616 (1,878)
Credit loss (benefit) expense recognized in OTTI, Net (3,890) 0 8,582 0
Total unrealized gains on investment securities 173,488 64,958 69,025 145,413
Amount reclassified into net income: Net actuarial loss 595 524 1,191 1,049
Total defined benefit pension and post-retirement plans 595 524 1,191 1,049
Other comprehensive income 174,083 65,482 70,216 146,462
Comprehensive income $ 208,266 $ 137,748 $ 119,635 $ 280,076