Fair Values of Assets and Liabilities (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Schedule of changes in level 3 assets and liabilities measured at fair value on recurring basis
Balance, beginning of period	$ 34,004	$ 44,050	$ 37,812	$ 49,641
Total gains or losses included in earnings	1,102	73	2,409	391
Total gains or losses included in other comprehensive income	(688)	975	1,580	2,902
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	(9,172)	0	(15,981)	(7,027)
Settlements	(2,034)	(4,579)	(3,069)	(5,388)
Transfers from Level 3	0	(11,965)		(11,965)
Transfers into Level 3	0		461
Balance, end of period	23,212	28,554	23,212	28,554
Obligations of States and Political Subdivisions [Member]
Schedule of changes in level 3 assets and liabilities measured at fair value on recurring basis
Balance, beginning of period		0		343
Total gains or losses included in earnings		0		4
Total gains or losses included in other comprehensive income		0		(20)
Purchases		0		0
Issuances		0		0
Sales		0		(327)
Settlements		0		0
Transfers from Level 3		0		0
Balance, end of period		0		0
Corporate Securities [Member]
Schedule of changes in level 3 assets and liabilities measured at fair value on recurring basis
Balance, beginning of period		14,815		21,376
Total gains or losses included in earnings		73		387
Total gains or losses included in other comprehensive income		77		(98)
Purchases		0		0
Issuances		0		0
Sales		0		(6,700)
Settlements		(3,000)		(3,000)
Transfers from Level 3	0	(11,965)		(11,965)
Balance, end of period		0		0
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Schedule of changes in level 3 assets and liabilities measured at fair value on recurring basis
Balance, beginning of period	24,508	27,665	22,980	26,352
Total gains or losses included in earnings	0	0	0	0
Total gains or losses included in other comprehensive income	(688)	898	1,580	3,020
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(2,028)	(1,579)	(2,768)	(2,388)
Transfers from Level 3	0	0		0
Transfers into Level 3	0		0
Balance, end of period	21,792	26,984	21,792	26,984
Equity Securities [Member]
Schedule of changes in level 3 assets and liabilities measured at fair value on recurring basis
Balance, beginning of period	1,420	1,570	1,420	1,570
Total gains or losses included in earnings	0	0	0	0
Total gains or losses included in other comprehensive income	0	0	0	0
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Transfers from Level 3	0	0		0
Transfers into Level 3	0		0
Balance, end of period	1,420	1,570	1,420	1,570
Loans Held for Sale [Member]
Schedule of changes in level 3 assets and liabilities measured at fair value on recurring basis
Balance, beginning of period	8,076		13,412
Total gains or losses included in earnings	1,102		2,870
Total gains or losses included in other comprehensive income	0		0
Purchases	0		0
Issuances	0		0
Sales	(9,172)		(15,981)
Settlements	(6)		(301)
Transfers from Level 3	0
Transfers into Level 3	0		0
Balance, end of period	0		0
Other Assets [Member]
Schedule of changes in level 3 assets and liabilities measured at fair value on recurring basis
Balance, beginning of period	0		0
Total gains or losses included in earnings	0		(461)
Total gains or losses included in other comprehensive income	0		0
Purchases	0		0
Issuances	0		0
Sales	0		0
Settlements	0		0
Transfers from Level 3	0
Transfers into Level 3	0		461
Balance, end of period	$ 0		$ 0